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The model number
The function(s) listed below. Some instruments have multiple functions - for example, the 4195A is a VNA, spectrum analyzer and an impedance analyzer. Therefore the 4195A is listed in multiple categories

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Accessory kits - various types
AC power analyzers - PA2201A and PA2203A
AC power supplies 6811C, 6812C, 6813C
Airlines
Arbitrary waveform generators M8194A
Amplifiers?493A, 495A?
Attenuators (optical) 8156A, 8157A, 8158B, 81566A, 81576A,?
Attenuators (RF) 8494A
Attenuator set (500 Ω) 350C
Attenuator set (600 Ω) 350D
Attenuator switch driver
Audio analyzers? 8903A, 8903B, 8903E,? ?
Base station test sets
Bit error rate testers (BERTs)
Cables
Capacitance meters U1701A, U1701B, 4272A, 4278A, 4279A
Capacitor Bridge 4270A,
Capacitor standards 16380A, 16380C,?
Carrier noise test setsi
Cesium frequency standards
Clamp ammeters
Close field probes
Crystal Impedance E4915A, E4916A
Data Acquisition Systems (DAQs)
DC power analyzers
DC power supplies 6030A , 6031A , 6032A, 6033A, 6035A, 6131C, 6621A, 6622A, 6623A, 6624A, 6627A, 6255A, 6645A, 6671A, 6672A, 6673A, 6674A, 6675A, 62003A, 62003C, 62003E, 62004A, 62004B, 62004E, 62005A, 62005B, 62005E, 62006A, 62006B, 62006E, 62010A, 62010C, 62010E, 62012A, 62012C, 62012E, 62015A, 62015C, 62015E, 62018A, 62018C, 62018E, 62024A, 62024C, 62024E, 62028A, 62028C, 62028E, 62048A, 62048C, 62048E
Delay lines
Detectors
Device current waveform analyzers
Digital communications analyzers
Directional couplers
Distortion analyzers 330B, 330C, 330D, 331A, 332A, 333A, 334A, 339A, 8903A, 8903B, 8903E,???
Dynamic measurement DC source
Electrometers
Fading simulators
Femto ammeters
Filters
Frequency counters 522B, 5342A 5343A 5352B
Frequency standards?
- Cesium frequency standards 5090A
- Off-air 60 kHz frequency standards
- Off-air 200 kHz frequency standards
- Off-air GPS frequency standards
- Quartz frequency standards 105A, 105B
Function Generators ? 3310A,? 8165A,
GPIB controllers, extenders, cables etc.
GPS frequency standards
Harmonic mixers
High resistance meters 4339B
- High resistance meter fixtures 16008B
HEV EV Grid Emulators and Test Systems
In-circuit test systems
Impedance analyzers 4195A, 4291A, 4291B, 4395A, 4396A, 4396B, 4294A, E4990A, E4991A
Impedance Analyzer Accessories
- Impedance Test Kit 41951A,?
- Test Fixture Adapter 16099A
- Test Fixture 16034G, 16034H, 16047A, 16191A, 16192A, 16193A, 16093B, 16194A, 16452A,
- Test Head 4291B
Impedance / Gain Phase analyzer 4194A
Impedance Meter 4193A,
Isolators
LCR meters? U1701A, U1701B, U1731A,? U1731B, U1731C, U1732A, U1732B, U1732C, U1733C, 4191A , 4192A, 4194A, 4195A, E4196A,? 4216A, 4260A, 4261A, 4262A? 4263A, 4263B, 4271B, 4274A, 4275A, 4276A , 4277A, 4284A, 4285A, 4286A, 4287A, 4291A, 4291B, 4294A, 4332A, 4342A, 4395A, 4396A, 4396B, E4980A and E4980AL
LCR meter calibration devices? 16380A 42030A? 42090A, 42091A and 42100A
LCR meter accessories
- 2-Terminal BNCs.
  - 41900A, 41901A
- 4-Terminal Pair (BNC connectors)
  - Cable extension 16048A, 16048D, 16048E, 16048G, 16048H
  - DC current bias accessories 42841A, 42842A, 42842B, 42842C, 42843A
  - DC voltage bias accessories 16065A, 16065C,
  - Kelvin clips 16089A, 16089B, 16089C,16089E
  - Lead Components 16047A,16047B, 16047D, 16047E
  - Material 16451B, 16452A
  - Probes 42941A
  - SMD 16034E, 16034G, 16034H
  - 2-port 16096A
- 7 mm (APC7)
  - APC-7 Connector Repair Kit 11591A
  - Binding post 16093A, 16093B
  - DC voltage bias accessory 16200B,
  - Lead components 16092A
  - Material 16453A, 16454A
  - SMD? 16192A, 16194A, 16196A, 16196B, 16196C, 16196D, 16197A, 16198A
LCZ meters? 4276A, 4277A,
Lightwave clock / data receivers
Lightwave converter
Lightwave component analyzer
Lightwave measurement system mainframes
Lightwave polarization analyzers 8509B
Logic analyzers
Nemo wireless network solutions.
Noise and interference test set
Noise figure analyzers
Noise sources 346A, 346B. 346C ,
Matching pads (50 ohm to 75 ohm or similar)
Materials test equipment
Microwave repeaters
Microwave downconverters 70427A
Microwave / THz sources
Milliammeter 428B
Milliohm meter
Mobile communications DC source
Modular instruments
- AXIe
- Data acquisition (DAQ)
- USB
- PXIe
Modulation analyzers
Multimeters 427A, 970A
Optical attenuators
Optical heads
Optical sources
Optical spectrum analyzers
Oscilloscopes 120A, 120AR, 120B, 122A, 130A, 130B, 130BR, 130C, 140A, 140B, 141A, 150A, 150AR, 160B, 180A, 180AR, 180CD, 181A, 181AR, 181T, 181TR, 182C, 182T, 183A, 183B, 184A, 184B, 185A, 185B, 1200A, 1200B, 1220A, 1221A, 1703A, 1707A, 1707B, 1710A, 1710B, 1715A, 1722A, 1725A, 1726A, 1740A, 1741A, 1742A, 1743A, 1744A, 1746A, 1980A, 1980B, 5403A, 6000A, 6000L, 16533A, 16534A, 54100A, 5410B, 54100C, 5100D, 54111D, 54120A, 54120B, 54200A, 54501A, 54502A, 54503A, 54504A, 54520A, 54520C, 54540A, 54540C, 54542A, 54542C, 54600B, 54601A, 54601B, 54602B, 54603B,? 54645A, 54654N, 54710A, 54720A, 54750A, 54825N, E1428,?
Oven controlled crystal oscillators (OCXOs)
Pattern generators
PCM terminal test set
Phase noise measurement
Pico ammeters
Printers 2225
Plotters 7470A, 7475A?
Probes
Protocol analyzers and exercisers.
Power booster test sets
Power meters 431A, 431B, 431C, 432A, 435A, 435B, 437B, 438A
Power splitters
Power supplies
Pulse generators
Q-meters 4342A?
- Q-meter calibration inductors 16470A
Reflection transmission test set
Return loss module (optical)
Relays / switches / switch matrices (optical)
Relays / switches / switch matrices (RF)
Resistor standards 42030A?and 42100A
S-parameter test sets
Scalar network analyzers
SCSI bus preprocessor interface E2324A
Selective level meters 3746A
Semiconductors
Semiconductor parameter analyzers 4145A, 4155B, 4156B,
Signal analyzers
Signal generators / sweep generators / signal sources / oscillators 200CD, 201B, 209A, 204D,? 608A,? 8165A
Software
Source measure units
Spectrum analyzers 4195A,???
Switch control units
SWR meter 415E?
Time interval? counters
Time mark generator 226A
Timing and data state modules
Torque wrenches
Transmitter testers
Trigger modules
Ultrasound transducers
Universal bridge? 4260A, 4265A, 4265B?
Vacuum tube voltmeter 410C
Vector Impedance Meter 4193A, 4800A, 4815A
Vector Network Analyzers (VNAs) 4195A,? 8510A, 8510B, 8510C, 8753A, 8753B, 8753C, 8753D, 8753E, 8753ES, 8752ET, 8719A, 8719B, 8719C, 8719D, 8720A, 8720B, 8720C, 8720D, 8720ES, 8722A, 8722B, 8722C, 8722D, 8722ES,
Vector Network Analyzers (VNA) calibration kits 85032B, 85032E, 85033C, 85033D, 85033E, 85050B, 85050C, 85050D, 85052B, 85052C, 85052D, 85054A, 85054B, 85054D, 85056A
Vector Network Analyzer (VNA) verification kits
Vector Signal Analyzer 89650S, 89600S
Vector voltmeters 8405A, 8508A,
VXI mainframes 70000B, 70000C
Waveform and function generators
Waveguide to waveguide and waveguide to coaxial transitions.
Wireless 58 OTA chambers
Wireless channel emulators
Wireless network emulators
Wireless communication test sets

Re: Intermittent REF UNLOCK error message on 8591A Spectrum Analyzer

#151217

Thanky you for the valuable information Yves!

I have now checked a bit further and made sure the VTO_TUNE reached the A9 Third Converter assembly ok.
My VTO_TUNE voltage varies between -0.43 (10 MHz Ref disconnected) to -13.27 Volt (10 MHz Ref connected).

My 300 MHz VCXO range is 299.872 MHz (10 MHz Ref disconnected) to 299.959 MHz (10 MHz Ref connected) - A total range of 88 kHz which is a bit smaller than yours 111 kHz.

This time I have meassured the frequency at the Cal Out to make the meassurement easier.

I have desoldered and checked the R68 potentiometer and it was fine.

Do you have any further good ideas?

Best Regards
Anders

Re: Manuals for an HP3456B DMM?

#151216

I picked up the meters today. They are model 3456A. Both work, but need some cleanup. The power switch on on unit sticks on and the front/rear terminal switch is dirty. A quick checkout shows both reading within a few mV of my 34401A. Now I need to port my GPIB tools to talk to them.

Re: HP 8594E new issue

#151215

Reset worked Config, 6, 6, 3.

Thank you!!!!

Re: HP 8594E new issue

#151214

6.3Vdc

Re: Intermittent REF UNLOCK error message on 8591A Spectrum Analyzer

#151213

开云体育

Hi,

I tested this with my 8591A.

I used an external generator for the 10 MHz reference.

I measured the 300 MHz signal returning to the A15 COUNTER LOCK module.

This way, I tested the path from the 10 MHz IN to A15, and the return from A9 THIRD CONVERTER at 300 MHz.

I measured the 300 MHz return at the spectrum, but kept the PLL closed loop using a T-connector.

The maximum range of the VCXO was 299.976-300.087 MHz, or 300 MHz -24/+87 kHz, but this is doubled if you measure the 600 MHz output.

The RF amplitude of this signal was approximately -4.5 dBm upon arrival at the A15 COUNTER LOCK module.

The DC control voltage coming from the A15 COUNTER LOCK module (J4-40) to A9 was -0.253/-13.2 Volts, and -4.645V was the voltage for an accurate input 10 MHz reference.

For adjustment, you can see from the wiring diagram that R68 presumably allows for range centering.

I haven't checked the manual yet, but I did check this potentiometer, as I've had several issues with defective potentiometers in this Spectrum series.

Yves

De?: [email protected] <[email protected]> De la part de Anders L??v via groups.io
贰苍惫辞测é?: 4 avril 2025 02:10
??: [email protected]
Objet?: Re: [HP-Agilent-Keysight-equipment] Intermittent REF UNLOCK error message on 8591A Spectrum Analyzer

After further digging into my Ref Unlock error message on the HP8591A Spectrum Analyzer I have found the following.

The 600 MHz SAW oscillator on A9 Third Converter assembly seems to oscillate at only 599.744 MHz on its own (without 10 MHz reference connected).

With the 10 MHz reference connected, the frequency only comes up to 599.920 MHz - It does not reach 600 MHz.

The VTO_TUNE signal between the Counterclock assembly and the A9 Third Converter assembly is maxed so it can not tune the 600 MHz SAW oscillator any further.

Can the 600 MHz SAW oscillator be tweaked in some way or is the next step to replace the A9 Third Converter assembly?

Re: HP 8594E new issue

#151212

Also, how is the voltage on your new battery?

-mark

Re: HP 8594E new issue

#151211

Odd that D13 would now be off.? We'll assume the 68230 and related circuitry is ok for the moment.

Along the same lines as what Yves suggested, you could also try resetting the CRT to DEFAULT SYNC.? Flying blind, it would be:

? CONFIG
? Softkey #6 (MORE)
? Softkey #6 (MORE)
? Softkey #3 (DEFAULT SYNC)

You could also try setting DEFAULT CONFIG:

? CONFIG

? Softkey #6 (MORE)

? Softkey #4 (DEFAULT CONFIG)

? Softkey #4 (DEFAULT CONFIG)? (second press needed to confirm)

Another thought is to try resetting the contents of the SRAM completely by grounding the + side of the supercap through a 10 ohm resistor to ground and hold it there for about 10 seconds (obviously with the power off). ?You'll then have to go through the initialization procedure on page 204. ?I know you were trying to avoid doing that in the first place, but it seems the most likely explanation is that something got corrupted in the SRAM during the battery replacement procedure.

-mark

On Fri, Apr 4, 2025 at 10:37 AM, KB2LMN wrote:

Show quoted text

Mark I took the boards back out and cleaned all the contacts good and seeded them in and out a few times now the lite D13 is off. I do still have the screen issue shown in the video. I also tried what Yves suggested with no luck.

?

Andrew

Re: HP 8594E new issue

#151210

Mark I took the boards back out and cleaned all the contacts good and seeded them in and out a few times now the lite D13 is off. I do still have the screen issue shown in the video. I also tried what Yves suggested with no luck.

Andrew

Re: RF Alignment Failure in Agilent CXA signal analyzer N9000A

#151209

Hi, Hardyhansendk.

Thank you for your response, As you mentioned about W9 cal signals, When I tested there I'm getting 50Mhz with -60dB not -25dB, it would be helpful if you share info regarding that. Once again thank you for your response.

Regards,

San.

Re: Intermittent REF UNLOCK error message on 8591A Spectrum Analyzer

#151208

After further digging into my Ref Unlock error message on the HP8591A Spectrum Analyzer I have found the following.

The 600 MHz SAW oscillator on A9 Third Converter assembly seems to oscillate at only 599.744 MHz on its own (without 10 MHz reference connected).

With the 10 MHz reference connected, the frequency only comes up to 599.920 MHz - It does not reach 600 MHz.

The VTO_TUNE signal between the Counterclock assembly and the A9 Third Converter assembly is maxed so it can not tune the 600 MHz SAW oscillator any further.

Can the 600 MHz SAW oscillator be tweaked in some way or is the next step to replace the A9 Third Converter assembly?

Re: HP 8594E new issue

#151207

Mark yes the display was normal.

Re: HP 8594E new issue

#151206

All LEDs should go off once boot is complete and the initial hardware check is finished. ?D13 being left on indicates there is a problem with the 68230 (U57) Parallel Interface/Timer. ?See Table 14-3 in the Assembly Repair manual for LED decoding.

It doesn't necessarily mean that U57 is bad; it could be something that's being tested that is connected to U57.

I assume you had a normal display before you replaced the battery? ?Is the SRAM card completely seated?

-mark

On Thu, Apr 3, 2025 at 07:58 PM, KB2LMN wrote:

Show quoted text

Ok I replaced the battery this am and all went great, yes I did copy the info as the manual states.

my new issue is the display as you will see in this video. I thought maybe I missed a connection when I re-assembled so I took all apart and checked and nothing was disconnected or wrong.

?

?

The Voltages look good according to the Power Supply indicator lights.

?

D1 - D16 all lite when powered on and go off with the exception on D13 as I believe this is normal?

?

Any suggestions would be appreciated.?

Re: HP 8594E new issue

#151205

开云体育

Hi,

I think you may have lost the calibration constants, at least the ones related to the display.

You'll have to do a blind test.

The soft buttons near the screen, the top one is #1 and the bottom one is #6.

CAL

MORE (soft button #6)

Soft button #4 for vertical adjustment

Soft button #5 for horizontal adjustment

Use the knob or the up and down arrows to see if you can synchronize the image.

Yves

HP 8594E new issue

#151204

Ok I replaced the battery this am and all went great, yes I did copy the info as the manual states.

my new issue is the display as you will see in this video. I thought maybe I missed a connection when I re-assembled so I took all apart and checked and nothing was disconnected or wrong.

The Voltages look good according to the Power Supply indicator lights.

D1 - D16 all lite when powered on and go off with the exception on D13 as I believe this is normal?

Any suggestions would be appreciated.?

Re: HP8920B Blowing Fuse

#151203

Hi Jeff. I feel your pain. And FYI, the power supply is a pain to work on. The PCB is held by a number of plastic stand-off type things that you have to squeeze closed and work the board out. But if you go this route, Q1 is a likely suspect.

I have attached the schematic of the power supply, at least this is what I have seen in the 8920's I've worked on.

Good luck!

Mark

Artesyn A9 PSU Schematic 710227-001rN.pdf

Re: HP 8594E battery power

#151202

Yes, the RTC is on the processor board and gets power through the connector to the SRAM board where the battery is located.? When the SRAM card is removed, you lose the time.

Regardless of the super-cap and any other optional external battery backup steps, I would also recommend going through the calibration constants backup procedure described in the Assembly-Level Repair manual, chpt. 3.? It only take s a few minutes to write down the constants.? If you make a mistake with the battery, your future self will thank you.

It's also possible to record and recover the cal constants from the output of the GPIB command "CAL DUMP", if you have a PC with a GPIB interface.

-mark

On Thu, Apr 3, 2025 at 06:01 PM, Ozan wrote:

Show quoted text

On Thu, Apr 3, 2025 at 10:24 AM, KB2LMN wrote:

Anyplace to attach an outside power supply so data doesn’t need to be re-entered when replacing battery??

Andrew

?

====

I assume you already found service manual sheet with all the data to be copied to paper for insurance. There is a super capacitor on the battery board, if it is still good it lasts long enough to desolder/solder the battery. For extra safety you can solder a parallel 3V battery with 10k-ohm in series. I think date/time is kept on a different board and it will be lost so don't be concerned if you see date to be wrong after battery change.

?

Ozan

?

Re: HP 8594E battery power

#151201

On Thu, Apr 3, 2025 at 10:24 AM, KB2LMN wrote:

Anyplace to attach an outside power supply so data doesn’t need to be re-entered when replacing battery??

Andrew

?

====

I assume you already found service manual sheet with all the data to be copied to paper for insurance. There is a super capacitor on the battery board, if it is still good it lasts long enough to desolder/solder the battery. For extra safety you can solder a parallel 3V battery with 10k-ohm in series. I think date/time is kept on a different board and it will be lost so don't be concerned if you see date to be wrong after battery change.

Ozan

HP8935 displaying AA Memory Battey Low Message

#151200

Friends,

My HP8935 is displaying the AA Memory Battey Low message, but the batteries are not low.? I am wondering if anyone else has experienced this.

Thanks!

Jeff KC8VFN

Re: HP8920B Blowing Fuse

#151199

This morning, I tried running it using a DC power supply and that led to it blowing the 15 Amp external fuse for DC power.? As I mentioned yesterday, if you try to use on AC, it blows the external 5 Amp AC fuse.? I have never had the cover off, but that is the decision I need to make now.? Send it off or have a go at myself.? I have a well-equipped lab but am not sure about a schematic for the power supply.? I will need to look for one.? I won't work on much of anything without one.? From what I've seen in response to my inquiries, it seems like Q1 is a possibility.? Will it be a SMD?? I have some SMD rework equipment, but not a ton of experience with it.? I normally work on Ham Radio Equipment, mostly repeaters, not HP test equipment.? Recommendations welcome.?

Thanks!

Jeff