Reference
3-38
370B User Manual
You need to change the switch in the instrument if you want to change the Offset
mode. Contact the local Tektronix Field Office or representative if you need to
change the Offset mode.
The Front Panel Terminals provide a means of connecting the Collector Supply
output, the Step Generator output and the display amplifiers to the device under
test.
The front panel CONFIGURATION switches determine the state of the base,
emitter, and collector terminals of the device under test. The control settings are
divided in two groups: EMITTER COMMON and BASE COMMON.
In the EMITTER COMMON range, the emitter terminal is connected to ground
and the CONFIGURATION controls determine the state of the base terminal.
When the CONFIGURATION is set to STEP GEN, the Step Generator output is
applied to the base terminal. In the OPEN (EXT) position, the base terminal is
left open. In this case measurements may be made with the base terminal left
open or with an externally generated signal applied to it through the EXT BASE
or EMITTER IN connector. When the CONFIGURATION is set to SHORT
(EMITTER), the base terminal is shorted to the emitter. When CONFIGU-
RATION is set to COLLECTOR SUPPLY, the Collector Supply output is
applied to the base terminal and the collector terminal is left open.
In the BASE COMMON group, the base terminal is connected to ground and the
CONFIGURATION controls determine the state of the emitter terminal. With the
CONFIGURATION set to STEP GEN, the Step Generator output is inverted and
applied to the emitter terminal. When the control is set to OPEN (EXT), the
emitter terminal is left open. In this case, measurements may be made with the
emitter terminal left open or with an externally generated signal applied through
the EXT BASE or EMITTER IN connector.
Devices to be tested are connected to the 370B through adapter connectors.
These connectors allow two devices to be set up at the same time for comparison
testing. The LEFT-RIGHT-STANDBY control determines which device is under
test. The 370B test adapters may be plugged into the adapter connectors. These
adapters provide sockets into which devices with various lead arrangements may
be placed for testing. Refer to the ACCESSORIES on page B–1 for test adapter
information.
The connectors labeled “SENSE” allow Kelvin sensing of voltages measured
under high current conditions. Kelvin sensing means that current is supplied to a
device under test through one set of contacts and the voltage is measured through
another set of contacts. This method of sensing voltage eliminates errors in
voltage measurements due to contact resistance.
Front Panel Terminal
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General