Keithley 195A: Difference between revisions
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* [[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). | 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}} | {{BeginSpecs}} | ||
| Line 23: | Line 24: | ||
{{Spec|Current (AC)|200 μA to 2 A full scale in decade ranges (Option 1950); True RMS; Crest factor <3:1 }} | {{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|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 RTD sensor}} | {{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 | Internal view, unit with Option 1950 board (bottom left) | 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 | Internal view, unit with Option 1950 board (bottom left) | Keithley 195A internal 2.jpg | Internal view, unit with Option 1950 board (bottom left) | ||
Keithley 195A internal 3.jpg | Internal view, Option 1950 board flipped up | Keithley 195A internal 3.jpg | Internal view, Option 1950 board flipped up | ||
| Line 44: | Line 53: | ||
[[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
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Rear panel
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Internal view, unit with Option 1950 board (bottom left), zero-ohm resistors W102 and W103 are lifted
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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
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Internal view towards the rear of the unit
