1. Introduction
Versatile 3 1/2 digit digital DC multimeter with various
indicator symbols, data hold function and low battery
warning indicator. The instruments can be operated with 5
or 9 Volt DC supply voltage. In 5 Volt operation, no
galvanic separation of measuring and operating voltage is
required. In this case, the module generates its own
internal minus 5V supply voltage, which enables it to
measure signals with the same common zero as the
supply
The instruments allow different applications such as
single ended, ratio measurement and differential.
•
Auto-polarity
•
200 mV full scale reading
•
Low power consumption
•
5 or 9 Volt DC operation (customer selectable)
•
Low battery warning (9 Volt operation only)
•
Annunciators for common engineering units and
decimal point
•
Hold function with annunciator
2. Safety instructions
No input may be taken outside the range VDD minus 1 V
and VSS at the input REF HI. No voltages outside the
±VDD range may be present at the IN LO and IN HI
inputs. If there is a danger that any input may be taken
outside these limits, it is necessary to fit a resistor of
suitable value to limit the current to 100 µA in series with
the input or damage to the unit may occur.
The maximum voltage allowed for any
connection to the PCB is 48 V DC. When
measuring voltages greater than 48 V, the
scaling resistors must be fitted
externally!
3. Specification
Accuracy
± 0.5 %
Linearity
±1 LSD
Sampling rate
3 per sec
Temperature stability
30 ppm/°C
Operating temperature
0 - 50 °C
Storage temperature
-20 - 70 °C
Supply voltage (5V mode)
3 - 7 V DC
Supply voltage (9V mode)
7 - 12 V DC
Supply current
2 mA
Backlight voltage
4.5 bis 5.5 V DC
Backlight current DPM961
40 mA
Backlight current DPM962
80 mA
Input impedance
100 MΩ
4. PCB
DPM961
DPM962
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A
°C
°F
µ
m
K
M
Ω
V
0
RB
LKT
LK7
14
LK1
LK2
LK5
LK6
1
2
CN1
RA
VR1
LKH
LK4
LKC
A
°C
°F
µ
m
K
M
Ω
V
0
LK7
LK6
LK5
14
LKT
LKH
LK4
LKC
1
2
CN1
VR1
