Keithley 197: Difference between revisions

Latest revision as of 12:37, 26 May 2024

Keithley 197
5½-digit digital multimeter Keithley 197 Produced from (?) to (?) Manuals Keithley 197 manual 197-901-01 Rev.A Keithley 197 manual 197-901-01 Rev.C 1990/2001 (no parts/schem.) Keithley 197-1972/1973 Interface Manual Rev.C 1991 (parts list but no schem.) (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

The Keithley 197 is a 5½-digit, 220,000-count LCD auto-ranging digital multimeter marketed as a "Microvolt DMM" because it has 1 μV display resolution in the 200 mV range. It has basic logging capabilities and optional GPIB.

Compared to the earlier Keithley 177 Microvolt DMM, it lacks the 20 mV/20 μA/20 Ω range but has one more digit resolution.

Key Specifications

DC Voltage	200 mV to 1000 V FS in decade ranges, 1 μV to 10 mV LSD
DC Current	200 μA to 10 A FS in decade ranges, 1 nA to 100 μA LSD
AC Voltage	200 mV to 750 V FS in decade ranges, True RMS
AC Current	200 μA to 10 A FS in decade ranges, True RMS
Resistance	200 Ω to 200 MΩ FS in decade ranges, 1 mΩ to 10 kΩ LSD, diode test in 2 kΩ and 200 kΩ ranges
Options	1972A: GPIB and Analog output 1973: GPIB

Links

Keithley 197 OLED display board / Bluetooth interface project thread @ EEVblog Forum / Project page @ Github / Video #1 / Video #2 (Graph)
Reverse engineering of the internal IEEE interface of the Keithley 197A @ EEVblog Forum
Keithley 197 teardown and repair (Kerry D. Wong)

Internals

The GPIB interface communicates with the base instrument over an opto-isolated serial port. It uses a separate MC146805 CPU.

Pictures

please add

Components

Some Parts Used in the Keithley 197

Part	Part Number(s)	Class	Description	Used in
Motorola 6800	156-0426-00 • 156-2413-00 • 156-5472-01	Monolithic integrated circuit	8-bit microprocessor	021-0206-00 • 021-0374-00 • 067-0902-00 • 067-1137-99 • 222 • 222A • 222PS • 2424L • 2445 • 2465 • 2467 • 4051 • 7250 • 7912 • 7912AD • 7A16P • 7A29P • 7B81P • 7B90P • 833 • 834 • 835 • 836 • CG5001 • CG551AP • CG5010 • CG5011 • DF1 • DF2 • DM5010 • FG5010 • MI5010 • SI5010 • PS5004 • PS5010 • SG5010 • Keithley 181 • Keithley 182 • Keithley 175 • Keithley 175A • Keithley 191 • Keithley 192 • Keithley 195 • Keithley 195A • Keithley 197 • Keithley 220 • Keithley 224 • Keithley 230 • Keithley 263 • Keithley 485 • Keithley 580 • Keithley 617
Motorola 6820	156-0427-00	Monolithic integrated circuit	"Peripheral Interface Adapter (PIA)"	021-0206-00 • 7A16P • 7B81P • 7B90P • Keithley 175A • Keithley 197 • Keithley 485 • Keithley 580
NEC μPD7225		Monolithic integrated circuit	LCD driver	Keithley 175A • Keithley 197 • Keithley 485 • Keithley 580
TMS9914	156-1444-00 • 156-1444-01	Monolithic integrated circuit	GPIB controller	11301 • 11301A • 11302 • 11302A • 2221 • 2230 • 2424L • 2440 • 4052A • 4054A • 021-0374-00 • 067-1137-99 • AM700 • DC5009 • DC5010 • DM5010 • DM5110 • DM5120 • DM5520 • FG5010 • MI5010 • SG5010 • SG5030 • SI5010 • PS5004 • PS5010 • Keithley 182 • Keithley 193A • Keithley 195 • Keithley 195A • Keithley 196 • Keithley 197 • Keithley 199 • Keithley 220 • Keithley 224 • Keithley 230 • Keithley 263 • Keithley 617

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 The '''Keithley 197''' is a 5½-digit, 220,000-count LCD auto-ranging digital multimeter marketed as a "Microvolt DMM" because it has 1 μV display resolution in the 200 mV range. It has basic logging capabilities and optional GPIB.
+Compared to the earlier [[Keithley 177|Keithley 177 Microvolt DMM]], it lacks the 20 mV/20 μA/20 Ω range but has one more digit resolution.
 {{BeginSpecs}}