DM501A

The Tektronix DM501A is a 4½ digit True RMS multimeter plug-in for the TM500 system.

Tektronix DM501A
4½ digit True RMS multimeter Tektronix DM501A Produced from 1980 to 1984 Manuals Tektronix DM501A Manual (with schematics) Tektronix DM501A Manual (no schematics) Tektronix DM501A Schematics (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

It replaced the DM501 (which suffered from accuracy limitations) in 1980. It also has a temperature input, requiring the P6601 PT-100 probe with a 2-pin LEMO S-series connector.

The DM501A was designed by Bill Mark.

Key Specifications

DC Voltage	200 mV_DC to 1000 V_DC in decade ranges; 0.05% + 0.01% (200 mV: 0.015% / 1000 V: 0.02%) FS
DC Input characteristics	Input resistance 10 MΩ; CMRR >100 dB at DC, 80 dB at 50 and 60 Hz (1 kΩ unbal.), NMRR 60 dB at 50 or 60 Hz
AC Voltage	200 mV_DC to 500 V_AC in decade ranges; 0.6% + 0.05% (500 V: 0.2%) FS; True RMS;
AC Input characteristics	Input impedance 10 MΩ // ≤160 pF; CMRR 60 dB at 50 or 60 Hz (1 kΩ unbal.)
DC Current	200 μA to 2 A in decade ranges; 0.2% + 0.015% FS
AC Current	200 μA to 2 A in decade ranges; 0.6% + 0.05% FS (20 Hz-10 kHz sine >5% FS)
Ohms	200 Ω to 20 MΩ in decade range; current 1 mA, 1 mA, 100 μA – 0.1 μA respectively; 0.15% (20 MΩ: 0.5%) + 0.015% FS
Temperature	–62°C to +240°C (+0/-6°C or +2/-8°C any probe, uncal.); +150°C, ±2°C cal. probe, ±4°C uncal. probe; +150°C to +240°C, +0/-6°C or +2/-8°C any probe, uncal.

Links

Documents Referencing DM501A

Document	Class	Title	Authors	Year	Links
Tekscope 1979 V11 N3.pdf	Article	A New DMM Family for the TM 500 Series	Bill Mark	1979	DM501A • DM502A • DM505 • P6601
070-2088-04.pdf	Book	TM500 Series Rear Interface Data Book		1985	AA501 • AF501 • AM501 • AM502 • AM503 • AM511 • DC501 • DC502 • DC503 • DC503A • DC504 • DC505 • DC505A • DC508 • DC508A • DC509 • DC510 • DC5009 • DC5010 • DD501 • DL502 • DM501 • DM501A • DM502 • DM502A • DM505 • DM5010 • FG501 • FG501A • FG502 • FG503 • FG504 • FG507 • FG5010 • LA501 • LA501W • WR501 • MR501 • PG501 • PG502 • PG505 • PG506 • PG507 • PG508 • PS501 • PS502 • PS503 • PS503A • PS505 • PS5010 • RG501 • SC501 • SC502 • SC503 • SC504 • SG502 • SG503 • SG504 • SG505 • SW503 • TG501 • TR501 • TR502 • MI5010 • MX5010 • SI5010

Rear interface

The DM501A has a rear input, selectable by a front-panel button, on B28 (Hi) / A29 (Lo). Unlike the DM501 (non-A), it has no digital outputs. Input voltage on the rear interface is limited to 200 V peak / 100 V RMS.

Pictures

DM501A
DM501A
DM501A Option 2 (no temperature range) on an extension cable
DM501A
DM501A rear connector
DM501A RHS
DM501A LHS
DM501A LHS, shielding removed

Components

Some Parts Used in the DM501A

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
Siliconix LD120	156-1306-00	Monolithic integrated circuit	4½ digit integrating ADC (analog section)	DM501A • DM5010
Siliconix LD121A	156-1305-00	Monolithic integrated circuit	4½ digit integrating ADC (digital section)	7A13 • DM501A