Falcon HED271 Manual De Instrucciones página 3

Connector CN1
Pin Name
1 IN HI
2 IN LO
3 VDD
4 VSS
5 COMMON
6 BL+
7 HOLD
8 REF HI
9 ON (Selected)
10 OFF (Not Selected) Connect to all unused annunciator or decimal point inputs
11 BL-
12 DP3
13 DP2
14 DP1
Connector CN2 (HED272/DPM962 only)
Pin Annunciator
1
2 A
3 ° C
4 ° F
5 µ
6 m
7 K
8 M
9
Ω
10 V
11
Links and Mode Connections (page 12)
Function
Links ANALOGUE COMMON to IN LO
Links ANALOGUE COMMON to V
Links REF HI to VR1 (remove link if using external reference voltage
circuit)
Power supply voltage mode link (see Power Supply Selection)
Power supply voltage mode link (see Power Supply Selection)
Disables low battery function. Always disable for 5V operation
TEST LINK. Forces display to 1888. Do not use for more than 2
seconds or damage to the display may occur
Internal Reference Voltage
The internal reference voltage (REF HI) is set by VR1.The voltage is factory set at 100.0mV but may be
trimmed to suit individual applications, eg. to compensate for the inaccuracy of external resistors when using
scaling configurations.
HED271/272 only:
This is a 9 turn pot for greatest accuracy.
Function
Positive measuring input
Negative measuring input
Module DC positive supply +5V or +9V
Module DC negative supply 0V
Analog common input
Backlight: connect to +5V or with external resistor for +9V supply *
Connect to VDD to freeze display
Positive reference voltage input
Connect to annunciator or decimal point inputs
Backlight negative supply. Note: connect directly to OV not to pin 4
Decimal point 1.999
Decimal point 19.99
Decimal point 199.9
Function
OFF (Annunciator Not Selected)
Amps
Degrees Celsius
Degrees Fahrenheit
Micro
Milli
Kilo
Mega
Ohms
Volts
ON (Annunciator Selected)
SS
* 271/961: 120Ω 1/2W
272/962: 82Ω 1/2W
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.
Annunciators: see page 12
HED271/DPM961 HED272/DPM962
Connect CN1 pins
2-5
Connect CN1 pins
4-5
Solder LK4
Solder LK5
Solder LK6
Solder LK7
Briefly bridge LKT Briefly bridge LKT
Solder LK1
Solder LK2
Solder LK4
Solder LK5
Solder LK6
Solder LK7
3