Operator`s manual

TRIG / GUARD Both the Trigger and Guard functions are at the DIN-7 connector. This group of pins includes

the positive and negative hardware trigger input lines and the two SM2064 Guarded Measurement Force and Sense

signals. The external trigger initiates reading(s) into the onboard buffer, and the 6W guard signals facilitate in-

circuit resistor measurements by means of isolating a loading node. The DIN-7 plug can be ordered from

Signametrics and is also available at many electronic hardware distributors. The connector is generically referred to

as a mini DIN-7 male. The trigger signal should be in the range of 3 V to 12 V peak. The two 6W guard signals

should never have more than 5 V peak across them.

Warning! The DIN connector pins are protected to a maximum of 35 V with respect to the PC chassis and

any other DMM terminal. Do not apply any voltages greater than 35 V to the DIN connector pins. Violating

this limit may result in personal injury and/or permanent damage to the DMM.

DIN-7, Pin number Function

2 Sync output, referenced to pin 4

7 External Trigger input, Positive

4 Trigger and Sync Common

1 Guard Source (SM2064)

6 Guard Sense (SM2064)

DIN-7 Connector Pin Description, view from bracket side.

3.5 Starting the Control Pane

You can verify the installation and gain familia

rity with the DMM by exercising its measurement functions using

the Windows based Control Panel. To run the control panel, double click the “SM2064.EXE” icon. If you do not

hear the relays click, it is most likely due to an installation error. Another possible source for an error is that the

SM60CAL.DAT file does not correspond to the installed DMM.

When the DMM is started the first time, using the provided control panel (SM2064.EXE), it takes a few extra

seconds to extract its calibration data from the on-board store, and write it to a file C:\SM60CAL.DAT

The Control Panel is operated with a mouse. All functions are accessed using the left mouse button. When the

DMM is operated at very slow reading rates, you may have to hold down the left mouse button longer than usual for

the program to acknowledge the mouse click.

29 Signametrics