DM502: Difference between revisions

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Tek dm502 front.jpg
Tek dm502 front.jpg
Tek dm502 left.jpg
Tek dm502 left.jpg
DM502_switch_inside.jpg|The cover removes easily using Pozdrive screwdriver
DM502_switch_inside.jpg|DM502 switch with cover off.  The cover removes easily using Pozdrive screwdriver.
Tek dm502 right.jpg
Tek dm502 right.jpg
Tek dm502 leftfront.jpg
Tek dm502 leftfront.jpg

Revision as of 17:39, 10 October 2022

Tektronix DM502
basic 3½ digit digital multimeter
Tektronix DM502

Produced from 1975 to 1988

Manuals
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix DM502 is a basic 3½ digit digital multimeter plug-in for the TM500 system.

It has an Int/Ext switch that allows alternate input connections via the rear interface to be selected.

The DM502 is available with an input for temperature measurement with a transistor temperature probe (P6430) using an NPN transistor, e.g. a 2N2484 (any NPN-Transistor with hFE >150 can be used).

The DM502A model adds an input for a PT-100 temperature probe (P6601), a True RMS converter, and offset circuits to read dB directly in all ranges. An "Option 2" instrument deletes the temperature measurement function, P6601 temperature probe, and all internal circuits associated with this function. The rear interface of DM502A is limited compared to the DM502: No current input and no reading output, see gallery below.

The 2 kΩ measurement range (+HI in DM502A) can be used for diode testing, since a current source of 1 mA is active and the reading corresponds to the (forward) voltage drop of the diode in Volts. The voltage can rise to a maximum of 10 V. A second voltmeter is needed to measure the voltage if 2 V are exceeded.

Key Specifications

Voltage ranges 200 mV to 200 V in decade steps; 1 kV (DC) / 500 V (AC) top range
Input impedance DM502 10 MΩ or direct JFET input >2 GΩ (by internal jumper)
Input impedance DM502A 10 MΩ
Current ranges 200 μA to 2 A in decade steps
Resistance ranges 200 Ω to 20 MΩ in decade steps

Links

Pictures

DM502

DM502A