Leader Electronics Corp. LDC-823A Instruction Manual - page 7
(9) Set the FUNCTION switch to PERIOD.
(10) Use the "MULTI" scales, and confirm the display as shown in Table 4-2-1. In the case that
the displayed figure shows other than 0 (zero), or when GATE indicator is lighted, push
the reset switch, then, GATE indicator disappears (gate is closed), and the display shows as
in Table 4-2-1.
MULTI
Display
X10
0.00 mS
X 100
0.000
mS
X1000
0.0000 mS
Table 4-2-1
(11) In the above 6-10 OYER-flow indicator always shows light off.
4.3
Input Connections
Connect BNC Connector of the accessory cable to the input terminal. Connect the ground
-
negative side of the clip to the common of the device under test. Connect the positive hot side
to the test point. The input is AC only (DC blocked by 0.1t.LF capacitor). The maximum allowable
voltage of the AC component of the input signal depends on frequency. The values are as follow:
Input Impedance
10Hz
400Hz
100Yrms or 280Yp-p
1Mn
400Hz
100kHz
20Yrms or S6Yp-p
Input Impedance
100kHz
2S0MHz
SYrms or 14Yp-p
son
10Hz
2S0MHz
SYrms or 14Yp-p
The maximum voltage of the DC component of the input signal is
±
100Y DC. When the input
signal is not a continuous sine-wave or is modulated, the following values are the maXU11um
allowable AC input voltages permitted in accordance with the frequency chart below.
Input Impedance
10Hz
400Hz
2S0Yp-p
1Mn
400Hz
100kHz
S6Yp-p
Input Impedance
100kHz
2S0MHz
14Yp-p
Son
10Hz
2S0MHz
14Yp-p
CAUTION NOTE: Caution should be taken not to get an electric shock when connecting
or removing the input cable. High voltage circuits and horizontal output pulses of flyback
transformers in TY -sets generate excessive voltages. The LDC-823A could be damaged by
exceeding input limitations. Therefore, never make a direct connection to these circuits.
The input impedance of this instrument is approx. 1Mn and shunted by approximately 30pF.
The input cable has a distributed capacity of approx. 70pF. As the capacitance becomes 100pF
in total, it is not recommended for such a circuit or a device under test as influenced by this
capacitance to be measured.
Note:
Do not connect the input of LDC-823A to a high impedance point of the device under
test. The parallel effects of this 1Mn/100pF combination affect the operation of the
circuit being tested.
. ..... 6 ....
e(