Operator`s manual

into the onboard buffer, or for im
mediate response. The Sync line can be used to issue or synchronize
operations with an external device, such as Componenet Handlers. The Six Wire Guard signals facilitate
in-circuit resistor measurements by means of isolating a loading node. A mating male DIN-7 plug can be
ordered from Signametrics. The connector is generically referred to as a mini DIN-7 male.
To activate the Trigger input, apply 3.5 V to 12 V (max). Connect the positve to the Trigger pin and the
negative to the Trigger and Sync Common pin.
The Sync output is an open collector capable of upto 20V. Typical current sinking is 0.5mA with a
current limit of 3mA. The width of the Sync signal depends on the selected Aperture. The minimum
width is about 200us when the Aperture is set to 130us. It can be enabled or disabled (default), set to a
positive or negative pulse, be set low or high using functions such as DMMOutputSync and
DMMSetSync
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.
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 line
1 Guard Source [1]
6 Guard Sense [1]
[1] Available with the SMU2064 model.
Figure 3-2. The DIN-7 connector pinout table.
Figure 3-3. The DIN-7 connector pin diagram as viewed from the front of the DMM.
29 Signametrics