Table 5-1.Front Panel Controls and ConnectorsContinued
These control the selection of ac or dc coupling for the input signal. When the
input amplifier control switch (No. 18) is in COM A, channel B coupling is
determined by setting of channel A coupling switch.
These select the attenuation of the input signal. The signal amplitude is reduced
by 10 in ×10 and by 100 in ×100. When the input amplifier control switch (No.
18) is in COM A, the channel B attenuation is determined by the channel A
INPUT A and B
These are the input BNC connectors for channels A and B.
These controls are used in conjunction with the ATTEN (Nos. 9, 12) to select
the voltage at which triggering will occur. With X1 attenuator selected, the
level is variable at ±2.5 volts, and ×100 at ±250 volts.
Channel A and B
The light will blink for the associated channel when triggering is occurring.
When the light is off, the input signal is below triggering level and on when the
signal is above triggering level.
Channel A and B
These switches control the selection of triggering on either the positive or
negative slope of the input signal.
This is the input amplifier control switch that selects independent operation of
channels A and B in SEP (separate) position. When in COM A (common A)
position, the signal at A is also applied to channel B; this disconnects the
channel B input circuitry. Channel B coupling and attenuation are then
determined by the channel A setting.
This indicator will flash on and off if more than 5 volts is applied to channel C
K, S, M, n, and Hz
These will light up to show the appropriate units multiplier of the measurement
This is a nine-digit LED display that shows the numerical measurement taken.
This indicates an overflow of one or more of the most significant digits
(leftmost from the decimal point) are not displayed.
Lights when the unit is in remote operation.
Lights when the counter's main gate is open and a measurement is in progress.
Table 5-2.Rear-Panel Controls and Connectors
Used to select 115 or 230 volt operation.
This requires the insertion of a 2.0 amp fuse for 115 volt or 1.0 amp fuse for
230 volt operation.
Input ac connector
Used to connect the input ac to the unit.
When this switch is in the OFF position, the counter is armed by the signal that
is selected for measurement. In the ON position, the measurement is armed by
an input other than the input being measured.
This input connector allows a separate outside signal to be used for the time
1 MHz OUT and 10
These connectors allow an internal oscillator signal to be used externally when
Applies a high to the output when the main gate is open.
This is an interface bus connector that allows the unit to receive programming