19
！
CAT
Ⅰ
(
1000V
)
CAT
Ⅱ(
300V
)
Ω
COM
20A
T1AL 250V
ALL INPUT
1KV MAX
500mA
MAX
V
1000V
MAX
DC I
AC I
Period
dB
dBm
%
Comp
Hold
Menu
Local
2nd
DC V
AC V
Ω
Freq
AC+DC
Rel
Rate
Esc
Shift
Trig
Auto
mA
POWER
ON
OFF
DC VOLTAGE
SOURCE
-
+
MED
AUTO
50000 Count Multimeter
TH1942
Input Resistance
= 10MΩ
CAUTION: Maximum Input=1010V peak
！
CAT
Ⅰ
(
1000V
)
CAT
Ⅱ(
300V
)
Ω
COM
20A
T1AL 250V
ALL INPUT
1KV MAX
500mA
MAX
V
1000V
MAX
DC I
AC I
Period
dB
dBm
%
Comp
Hold
Menu
Local
2nd
DC V
AC V
Ω
Freq
AC+DC
Rel
Rate
Esc
Shift
Trig
Auto
mA
POWER
ON
OFF
SOURCE
50000 Count Multimeter
TH1942
AC VOLTAGE
MED
AUTO
Input Impedance = 1.1
MΩ
and 100pF
CAUTION: Maximum Input = 750V RMS or 1000V peak, 3
×
10
7
V-Hz
Figure 3-1 DC and AC Voltage Measurement Connections
3.3 Measuring Current
Model TH1942 current measurement range: 5mA, 50 mA, 500 mA (DC only), 5A, 20A
Maximum resolution: 100nA (on 5 mA range)
3.3.1 Connections
Assuming Model TH1942 is under factory default conditions, the basic procedure is as follows:
1. Connect test leads to 500mA terminal and COM terminal or 20A terminal and COM terminal.
2. Select DCI or ACI measurement function by pressing
Shift
→
DCV
or
Shift
→
ACV
3. Press
toggles auto ranging. Notice the
AUTO
annunciator is displayed with auto ranging. If
you want manual ranging, use the RANGE
and
keys to select a measurement range
consistent with expected current.
4. Connect test leads to the source as shown in Figure 3-2:
