Hameg HM8123 User Manual page 23

33
34 36 35
nd
2 Setting the trigger level with the numerical keys
entered value will be accepted with the unit millivolts (mV).
ARMED / MHz (pushbutton)
Button with two functions:
st
1 Pressing this button will select the ARMED mode.
2 nd Setting the gate time with the numerical keys
entered value will be accepted with the unit milliseconds
(ms).
OFFSET / Hz/ns (pushbutton)
Pressing this button will activate the OFFSET function.
GATED / kHz/us (pushbutton)
Pressing this button will activate the GATED mode.
Function pushbuttons to
A
A B C D
G H I K
These buttons have two functions:
1 st The measurements function are called by operating these
buttons. The corresponding button will light up.
2 nd Setting the trigger level or the gate time, the desired
value can be entered with this buttons and the unit buttons
(mV , V and ms , s ). Also refer to chap. Gate time
and Triggering. None of these button is lit.
A FREQ A Frequency channel A
B FREQ B Frequency channel B
C FREQ C Frequency measurement channel C
D PER A Period channel A
E Width A Pulse width channel A
F A : B Frequency ratio of channels A : B
G Duty A Duty cycle channel A
H TI AB Time interval AB
I TI avg AB Time interval AB averaged
K Phase AB Phase difference AB
38 37
, the
, the
M
E F
L
M
C o n t r o l s a n d d i s p l a y
L RPM A Rpm measurement channel A
TOTAL A Event counting channel A
M
TRIG/ARM INPUT (BNC connector)
External gate control input
Rear Panel
Interface
USB/RS-232 interface (HO820);
Option: IEEE-488 GPIB (HO880)
A (BNC connector)
Trigger signal channel A output (e.g. for display on a scope).
Signal level 0 to + 5 V (TTL level)
B (BNC connector)
Trigger signal channel B output (e.g. for display on a scope).
Signal level 0 to + 5 V (TTL level)
GATE (BNC connector)
Gate view output. This output will be high as long as the gate
is open during a measurement.
10 MHz Ref. (BNC connector)
External reference input (10 MHz)
RESET (BNC connector)
External reset signal input (TTL level). The function is iden-
tical to that of the RESET pushbutton
Mains input connector
39
.
Subject to change without notice
23