Front Panel Commands Hm 8021 - Hameg Instruments HM 8021-4 Manuel

Front panel commands HM 8021-4

1
OF
2
GT
Ext
10
1
0.1
S
GATE TIME
3
[1] OF (LED)
This LED is lit when an overflow occurs.
This depends on the selected gate
time and on the frequency of the signal
applied.
[2] GT (Gate Open; LED)
The gate indicator is lit when the gate is
open for measurements. This time equals
the preselected gate time and a synchroni-
zation time. The gate cannot be open for
a time smaller than 1 period of a signal.
[3] Gate Time (Gate time selector;
pushbuttons+LEDs)
The gate time is selectable in steps of 0.1s,
1s, 10s.
EXT. (LED)
In the GATE EXTERNAL position, the
counter will expect an external control
signal, and will not measure until such a
signal is supplied.
[4] Display Hold (pushbutton + LED)
Depressing the DISPLAY HOLD pushbutton
sets the display time to infinity and freezes
the last measurement result. A new
measurement can be initiated using the
reset pushbutton. Measuring will restart
when Display Hold is switched off. Dis-
play Hold starts and stops counting in the
TOTALIZE function mode.
22
1.6 GHz COUNTER HM 8021-4
DISP. HOLD OFFSET
FC FA PA TI
FUNCTION
4 5
MADE IN GERMANY
RESET
! CAT I
TI TOT.
INPUT C
0.1 - 1.6 GHz
50Ω
8
6 7
[5] Function indicators
LEDs (Refer to "Measuring functions")
Function (pushbuttons)
The "left" and "right" pushbuttons select
the desired function. The appropriate LED
is lit when a function is selected. The default
value when switching power on is
Frequency A.
[6] OFFSET (pushbutton + LED)
The displayed value becomes the reference
value. (Not available with the TOTALIZE
function).
[7] RESET (pushbutton + LED)
Stops a measurement and clears the display
in normal measurement mode. When
depressing the button in DISPLAY HOLD-
mode the counter performs a single
measurement (one shot) on release of the
button. When the OFFSET-mode is
activated, depressing RESET shows the
reference value (which is the actual offset).
Reset is active as long as the button is de-
pressed.
[8] INPUT C (BNC-connector)
Frequency range: 100 MHz to 1.6 GHz.
Input impedance 50Ω.
Attention! Do not apply more than 5V
(DC+AC peak) to this input terminal.
Instruments
Hz
S
TRIGGER
AUTO
DC
INPUT A
DC-150 MHz
1:20
1MΩ Ω
9 10 12
11
Subject to chance without notice
15
14
13