DM501A

Manuals – Specifications – Links – Pictures

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

It replaced the DM501 (which suffered from accuracy limitations) in 1979. 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 mVDC to 1000 VDC 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 mVDC to 500 VAC 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.

Options

Option 02 deletes P6601 temperature probe and capability.

Links

Documents referencing DM501A

Prices

DM501A Year Catalog price In 2026 dollars 1980 $555 ~$2,200 1982 $630 ~$2,100 1984 $700 ~$2,200

DM501A Opt.02 Year Catalog price In 2026 dollars 1980 $430 ~$1,700 1982 $505 ~$1,700 1984 $600 ~$1,900

P6601 Year Catalog price In 2026 dollars 1980 $145 ~$570 1982 $180 ~$610 1984 $210 ~$660

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

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  DM501A

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  DM501A

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  DM501A Option 2 (no temperature range) on an extension cable

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  DM501A

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  DM501A rear connector

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  DM501A RHS

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  DM501A LHS

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  DM501A LHS, shielding removed

Components

Some Parts Used in the DM501A