Keithley 177: Difference between revisions
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|class=Multimeter | |class=Multimeter | ||
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|summary=4½-digit digital multimeter | |summary=4½-digit TRMS digital multimeter | ||
|image=Keithley 177 front.jpg | |image=Keithley 177 front.jpg | ||
|caption=Keithley 177 | |caption=Keithley 177 | ||
Revision as of 07:39, 27 May 2024
The Keithley 177 Microvolt DMM is a 4½-digit digital multimeter marketed as a "Microvolt DMM" because it has 1 μV display resolution in the 20 mV range.
It was also available re-branded by Racal-Dana as the model 4003.
Key Specifications
| Voltage | 20 mV (AC: 200 mV) to 1000 V in decade ranges |
|---|---|
| Current | 20 μA (AC: 200 μA) to 2 A in decade ranges |
| Resistance | 20 Ω to 20 MΩ in decade ranges |
| Power | 105–125 or 210-250 V, 50–60 Hz, 8 W |
| Features |
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| Options |
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Links
- Keithley 177 @ radiomuseum.org
- Keithley 177 @ amplifier.cd (German/English text)
- Keithley 177 Microvolt DMM Repair – EEVblog #777 @ YouTube
- Refurbishing a Keithley 177 Microvolt DMM – Craig Hollinger @ YouTube
- Power Supply Replacement for Keithley 177 (to replace failed transformer) / PCB project @ Tindie
- See also Keithley 197
Internals
The Keithley 177 uses the Intersil ICL8052/ICL7104 4½-digit DVM chip set.
Pictures
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Re-drawn schematics
please add
Components
Some Parts Used in the Keithley 177
| Part | Part Number(s) | Class | Description | Used in |
|---|---|---|---|---|
| AD536 | 156-1259-00 | Monolithic integrated circuit | RMS/DC converter | DM501A • DM502A • DM5010 • Keithley 177 • Keithley 179 • Keithley 195A |
| Intersil ICL8052 | Monolithic integrated circuit | 4½ digit A/D converter | Keithley 177 • Keithley 179 • Keithley 480 |