TDE Instruments DPM961 Panel Mount Digital Multimeters Instruction Manual

Rev-2020-01
DPM961 / DPM962
Instructions manual

DPM961 Panel Mount Digital Multimeters

Panel Mount Digital Multimeters

Dimensions

| DPM961| DPM962
---|---|---
A| 24mm| 36mm
B| 3,5mm| 9mm
C| 2,54mm| 2,54mm
D| 22mm| 33mm
E| 48mm| 72mm
F| 37mm| 61mm
G| 45mm| 68mm
H| 14mm| 14mm
J| 10mm| 10mm
K| 5mm| 6mm
L| 2,54mm| 2,54mm
M| 3mm| 3mm
N| 13mm| 18mm
O| 10mm| 14mm

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

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!

Specification

PCB

|
---|---

Connector CN1

supply.
DPM961: 120 Ω, 0.5 W;
DPM962: 82 Ω, 0.5 W
Pin7| HOLD Connect to VDD to freeze display
Pin8| REF HI Positive reference voltage input
Pin9| ON (Selected) Connect to decimal point inputs
Pin10| OFF (Not Selected) Connect to all unused decimal point inputs
Pin11| BL- Backlight negative  supply. Note: connect directly to 0 V not to pin 4
Pin12| DP3 Decimal point 1.999
Pin13| DP2 Decimal point 19.99
Pin14| DP1 Decimal point 199.9

Note

Any signal cables connected to this device must not exceed 30 metres in length. If signal cables are installed that are routed outside the building, it will be necessary to install additional surge protection devices.

Analogue Inputs and Internal ReferenceVoltage

IN HI, IN LO and REF HI are all differential inputs. They respond to the voltage across them and not to the voltage with respect to the power supply. The only exception to
this is in 5V mode where the analogue common and VSS have been connected together. There is a limit to the voltage which can be measured using a differential input and this is known as the common mode range.
The internal reference voltage (REF HI) is set by the potentiometer VR1. The voltage is factory set at 100.0 mV but may be trimmed to suit individual applications, e.g. to compensate for the inaccuracy of external resistors when using scaling configurations.

Power Supply Selection

The modules can be operated with 5 or 9 V DC supply voltage. In 5V operation no separation of measuring and supply voltage is necessary. In 5V operation, however, the low battery function must be disabled. In 9V operation, it may be enabled or disabled. The desired operating mode is activated by open or closed LK solder bridges on the printed circuit board of the module.

Links and Mode Connections

5-Volt-Mode:
LK5 Open
LK6 and 7 Shorted
9-Volt-Mode:
LK5 Shorted
LK6 Open
Links ANALOGUE COMMON to IN LO:
DPM961: Connect CN1 pins 2–5
DPM962: Solder LK1
Links ANALOGUE COMMON to VSS:
DPM961: Connect CN1 pins 4–5
DPM962: Solder LK2
Links REF HI to VR1 (remove link if using external reference voltage circuit):
LK4 Shorted
Links REF LO to ANALOGUE COMMON:
LKC Shorted
Links REF LO to IN HI:
LKH Shorted
Disables low battery function. Always disable for 5V operation:
LK7 Shorted
TEST LINK. Forces display to 1888. Do not use for more than 2 seconds or damage to the display may occur:
Briefly bridge LKT

Configuration

The instruments are configured for the respective application circuit by setting LK solder bridges and pin connections on pin header CN1. The measuring range is configured by attaching external resistors. With the DPM962, the resistors can also be soldered internally to positions RA and RB. A 0 Ω SMD resistor is attached for RA, which must be removed before the THT resistors can be soldered.
0.1% resistors are required to maintain an accuracy of 0.1%. This may be relaxed if an accuracy less than this is required.

Links

Configuration Annunciator

Configuration Decimal Point

Application Circuits

Voltage / Current

Voltage and Current

Voltage Ratio

Resistance

Temperature using a Thermocouple

TDE Instruments GmbH
Gewerbestraße 8
D-71144 Steinenbronn
Tel.: +49 7157 20801
Fax: +49 7157 20813
Email: info@tde-instruments.de
Web: www.tde-instruments.de

References

• Großhandel für Messtechnik | TDE Instruments

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