Keithley 195A: Difference between revisions
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(Created page with "{{Instrument Sidebar |manufacturer=Keithley |model=195A |class=Multimeter |series= |summary=Digital Multimeter |image=Keithley 195A.jpg |caption=Keithley 195A |introduced=(?) |discontinued=(?) |designers= |manuals= * Media:195A_901_01C.pdf * Media:195A_901_01F.pdf }} The '''Keithley 195A''' is a 4½-digit LED True-RMS, auto-ranging digital multimeter. It features rudimentary a standard GPIB interface. {{MissingSpecs}} ==Pictures== <gallery> Keithley 195A.jpg...") |
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|class=Multimeter | |class=Multimeter | ||
|series= | |series= | ||
|summary= | |summary=5½-digit TRMS digital multimeter | ||
|image=Keithley 195A.jpg | |image=Keithley 195A front.jpg | ||
|caption=Keithley 195A | |caption=Keithley 195A | ||
|introduced= | |introduced=1984 | ||
|discontinued=(?) | |discontinued=(?) | ||
|designers= | |designers= | ||
|manuals= | |manuals= | ||
* [[Media: | * [[Media:Keithley 195A-901-01F.pdf|Keithley 195A manual, Rev.F, 1991]] | ||
* [[Media: | * [[Media:Keithley 195A-093-01A.pdf|Keithley 195A Programming Manual]] | ||
{{ROM Images}} | |||
}} | |||
The '''Keithley 195A''' is a 5½-digit LED True-RMS, auto-ranging digital multimeter. It features a standard GPIB interface. | |||
Current and True RMS ranges are optional (Opt. 1950). | |||
{{BeginSpecs}} | |||
{{Spec|Voltage (DC)|20 mV to 1000 V full scale in decade ranges; >1 GΩ input resistance (10 MΩ in 20 V and above ranges) }} | |||
{{Spec|Voltage (AC)|200 mV to 700 V full scale in decade ranges; 2 MΩ // 75 pF; 250 kHz; True RMS; Crest factor <3:1 }} | |||
{{Spec|Current (DC)|20 μA to 2 A full scale in decade ranges (Option 1950) }} | |||
{{Spec|Current (AC)|200 μA to 2 A full scale in decade ranges (Option 1950); True RMS; Crest factor <3:1 }} | |||
{{Spec|Resistance|20 Ω to 20 MΩ full scale in decade ranges, 2- or 4-terminal }} | |||
{{Spec|Temperature|–200 °C to +630 °C using a PT-100 (DIN 43760) RTD sensor, 4-wire or 3-wire connection }} | |||
{{Spec|Reading rate|3½ digits: 3.3 ms integration, 76 rdgs/s; 4½ digits: 16.66 ms integration, 36 rdgs/s; 5½ digits: 100 ms integration, 9 rdgs/s }} | |||
{{Spec|Power|105–125 V or 210–250 V, 50–400 Hz, 24 VA (with low-voltage transformer option, 90–110 V or 180-220 V) }} | |||
{{Spec|Connections|Analog: 5-way binding posts on front and back, switch-selectable; Digital: Trigger Input and Voltmeter Complete output, rear panel, [[BNC connector]]s, TTL level; GPIB interface standard }} | |||
{{EndSpecs}} | |||
==Links== | |||
* [https://www.youtube.com/watch?v=-Gvz24FEorE Keithley 195A DMM Restore/Calibration/Teardown] by Tony Albus @ YouTube | |||
==Internals== | |||
If option 1950 is installed, two jumper wires (zero-ohm resistors), W102 and W103, are to be removed from the circuit. | |||
==Pictures== | ==Pictures== | ||
<gallery> | <gallery> | ||
Keithley 195A.jpg | Keithley 195A.jpg | ||
Keithley 195A front.jpg | Keithley 195A front.jpg | Front panel | ||
Keithley 195A rear.jpg | Keithley 195A rear.jpg | Rear panel | ||
Keithley 195A internal 1.jpg | Keithley 195A internal 1.jpg | Internal view, unit with Option 1950 board (bottom left), zero-ohm resistors W102 and W103 are lifted | ||
Keithley 195A internal 2.jpg | Keithley 195A internal 2.jpg | Internal view, unit with Option 1950 board (bottom left) | ||
Keithley 195A internal 3.jpg | Keithley 195A internal 3.jpg | Internal view, Option 1950 board flipped up | ||
Keithley 195A internal 4.jpg | Keithley 195A internal 4.jpg | Internal view of main board under option/shield | ||
Keithley 195A internal 5.jpg | Keithley 195A internal 5.jpg | Internal view towards the rear of the unit | ||
</gallery> | </gallery> | ||
==Components== | |||
{{Parts|Keithley 195A}} | |||
[[Category:Keithley]] | [[Category:Keithley]] | ||
[[Category:Digital multimeters]] | [[Category:Digital multimeters]] | ||
[[Category:GPIB interface]] | |||
Latest revision as of 04:37, 2 August 2024
The Keithley 195A is a 5½-digit LED True-RMS, auto-ranging digital multimeter. It features a standard GPIB interface. Current and True RMS ranges are optional (Opt. 1950).
Key Specifications
| Voltage (DC) | 20 mV to 1000 V full scale in decade ranges; >1 GΩ input resistance (10 MΩ in 20 V and above ranges) |
|---|---|
| Voltage (AC) | 200 mV to 700 V full scale in decade ranges; 2 MΩ // 75 pF; 250 kHz; True RMS; Crest factor <3:1 |
| Current (DC) | 20 μA to 2 A full scale in decade ranges (Option 1950) |
| Current (AC) | 200 μA to 2 A full scale in decade ranges (Option 1950); True RMS; Crest factor <3:1 |
| Resistance | 20 Ω to 20 MΩ full scale in decade ranges, 2- or 4-terminal |
| Temperature | –200 °C to +630 °C using a PT-100 (DIN 43760) RTD sensor, 4-wire or 3-wire connection |
| Reading rate | 3½ digits: 3.3 ms integration, 76 rdgs/s; 4½ digits: 16.66 ms integration, 36 rdgs/s; 5½ digits: 100 ms integration, 9 rdgs/s |
| Power | 105–125 V or 210–250 V, 50–400 Hz, 24 VA (with low-voltage transformer option, 90–110 V or 180-220 V) |
| Connections | Analog: 5-way binding posts on front and back, switch-selectable; Digital: Trigger Input and Voltmeter Complete output, rear panel, BNC connectors, TTL level; GPIB interface standard |
Links
- Keithley 195A DMM Restore/Calibration/Teardown by Tony Albus @ YouTube
Internals
If option 1950 is installed, two jumper wires (zero-ohm resistors), W102 and W103, are to be removed from the circuit.
Pictures
-
-
Front panel
-
Rear panel
-
Internal view, unit with Option 1950 board (bottom left), zero-ohm resistors W102 and W103 are lifted
-
Internal view, unit with Option 1950 board (bottom left)
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Internal view, Option 1950 board flipped up
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Internal view of main board under option/shield
-
Internal view towards the rear of the unit
