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Digital Panel Meters
 Set Point Comparator
Asahi Digital panel meters from Asahi Keiki
offer impressive specifications, reliability
 and low cost for a variety of applications
 
AM-749      Features
  • Four Set Points
  • Conversion rate 12.5 /sec (50Hz), 15 /sec (60Hz)
  • Peak, Valley, Peak-Valley Hold, Digital zero.
  • Eight pattern setting (EEPROGRAM back up)
  • Includes sensor power supply 12V, 80mA
  • Power supply AC 90 - 264 Volts
  • Direct setting function
  • Data output BCD, RS232, RS485 or analog
  • Relay or photo-coupler comparator output
Comparator AM749
 
DC Voltage Measurement
Accuracy +/- 0.03% of reading +/- 2 digit (23 C +/-5 C
Model Range Display
adjustable		 Input 
Impedance		 Max Allowable
input voltage		 view shopping cart
11 +/-199.99 mV offset
+/- 10000
Full scale
 +/- 0 to 19999
 100 MOhm +/- 250 V Add item to shopping cart
12 +/-1.9999 V 100 MOhm +/- 250 V
13 +/-19.999 V 1 MOhm +/- 250 V
14 +/-199.99 V 10 MOhm +/- 500 V
15 +/- 700 Volts 10 MOhm +/- 700 V
1V 1 - 5 Volts 1 MOhm +/- 250 V
 
DC Current Measurement
Accuracy +/- 0.1% of reading +/- 2 digit (23 C +/-5 C
+/- 0.3% of reading +/- 1 digit only for 25 range
Model Range Display
adjustable		 Input
Impedance		 Max allowable
input current		 view shopping cart
23 +/-19.999 mA offset
+/- 10000
Full scale
 +/- 0 to 19999		 10 Ohm +/- 150 mA Add item to shopping cart
24 +/-199.99 mA 1 Ohm +/- 500 mA
25 +/-1.9999 A 0.1 Ohm +/- 3 A
2A 4 - 20 mA  10 Ohm +/- 150 mA
 
General Specifications
Measurement Block
Measurement function Specify one measuring range from DC voltage, current ranges below.
Input Circuit Single Ended
Operation method dual slope
Input Bias Current 100 pA
Conversion Rate 12.5 /sec (50 Hx) 15 /sec (60Hz)
Normal mode rejection > 50dB (50/60Hz)
Display 7 segment LED, 10 mm red
monitor sub display LED 8mm green
Polarity "-" automatic when result is negative
Decimal point Set to any position
Over-range indication 'OL' LED flashes
Maximum Display  +/- 99999 ( 5 digits )
Decimal point set to any position
Zero Display Reading "zero" suppression
 
External Control
Hold Shorting between COM and S/H terminal or "0" level
Start  Open between COM and S/H terminal or "1" level
Digital zero Value just before COM and DZ terminals are shorted, or input is set to "0", is displayed as "zero" and that value is stored
Peak Hold Respective function is activatedd when COM and PH terminals are shorted or input level is set to "0"
Valley Hold
Peak Valley Hold
Pattern selection Anyone of eight patterns is settable in combination of COM terminal with any of P SEL terminals 0, 1 and 2
"0" level less than 5 volts
"1" level 3 - 30 volts
input current less than -5 mA
 
Comparison Block
Control Method Computation by microcomputer
Measuring range
comparison		 high/Low limit setting including polarity, -99999 to + 99999
Setting condition By sampling period
No setting condition for set value
Comparison Condition  
High/High limit set-value < measured value HH
High/High limit set-value > measured value HI
High/High limit set value      
High limit set value		 >/= measured value>/= Low/Low limit set value
Low limit set value		 GO
Comparison Relay
contact capacity		 250 Volts AC 0.2A resistive load
120 Volts AC 0.5A resistive load
28 Volts AC 1 A resistive load
Photo-coupler output sink current 20 mA max )less than 30 V.
Output saturation voltage < 1.2 Volts at 20 mA
Hysteresis Settable from 1 to 9999 digits for each comparison set value
External Control Comparison operation is suspended when COM and  r1R.RES terminals are shorted or iput level is set to "0"
"0" level less than 1.5 V
"1" level 3 to 30 V - input current < - 5mA
  
Common Specifications
Memory Backup Set data stored for 10 years by ERPROM
Temperature and humidity 0 - 50 degs C, 35% to 85% RH
Power Supply AC 90 - 264 V
Operation temperature 0~ 50 C, 35 - 85% RH
Power Consumption 5VA at 100 V AC
Dimension mm H x W x D 48 x 96 x 161 DIN
Weight Approx 600 gm 
Dielectric Strength 500 V DC between input/earth and case
500 V DC between input terminal/common, digital common, sensor power supply and relay output.
1500 VAC between power supply terminal/common, digital common, sensor power supply case and relay output
Insulation Resistance DC 500V 100 MOhm at above terminals
Noise rejection Power terminals, normal/common mode +/- 1500V square waveform for 1 ns at rise, noise, width 500 ns (by noise simulation)
Sensor Power Supply 10 V +/- 10%, 80 mA
  
Optional Outputs
BCD output (isolated from input (LO))
Measured data Negative logic
NPN open-collector outpug
Polarity signal Transistor on at minus input
OVER signal Transistor on at "OVER" input
Printing Command Signal Transistor on for approx 10 ms at end of measurement
ENABLE: All data output transistors arte turned "OFF" when "ENABLE" and digital common terminals are shorted or input level is set at "0".
 "0" level less than 1.5 V
"1" level 3 to 30 V 
input current < -5 mA
Transistor output capacity Applied Voltage 30 V max, Current 10mA max.
Output saturation voltage less than 1.2 V at 10 mA
TTL output is also available
 
RS232C (isolated from input (LO))
Communication method Full duplex
Synchronous method Start and Stop
Transmission speed 2400/4800/9600/19200 bps
Start Bit 1 Bit
Data length 7 Bit
Error detection Even parity
Stop Bit 2 Bits
Character Code ASC II
Transmission control none
 
RS485 (isolated from input (LO))
Communication method 2 wire system half duplex
Synchronous method Start and Stop
Transmission speed 2400/4800/9600/19200 bps
Start Bit 1 Bit
Data length 7 Bit
Error detection Even parity
BCC (Block Check Character) Check sum
Stop Bit 2 Bits
Character Code ASC II
Transmission control none
Signal Name Signal Direction
Non-reversible output + Input/output
Reversible output - Input/output
Number of connectable meters Up to 31 units
cable length up to 500 m in total
 
Analog Output (isolated from input (LO))
Any display range to output analog signal can be set
Resolution 16 Bits
Output Response < 0.5 secs
Output Resistive load Accuracy
23 degs C +/- 5 degs		 Ripple
1 to 5 V > 10 KOhms +/- 5% full scale 50 mV p-p
4 - 20 mA 0 - 600 Ohms +/- 5% full scale -
Moving Average Digital Filter Function
Fixed zero 10e0 digit is fixed to "0" for display
Display Blanking Blanking of LEDs on main, monitor/sub display units.
 
 
AM749 connections
Click for larger image
Ordering Information
AM-749-xx-1-y-z Use the part numbers above for the range and add the following final characters to designate options view shopping cart
Affix xx Voltage 11, 12, 13, 14, 15, 1V
Current 23, 24, 25 2A		 $665.00 Add item to shopping cart
Affix y Data Output
1 = None
2 = BCD
3 = RS485
4 = RS232C
5 = Analog		 $685.00
$760.00
$785.00
$798.00
$815.00
Affix z Comparator output
1 = relay
2 = photo		  
 

Topac Inc. 231 CJC Highway, Suite 103 Cohasset MA 02025 USA
Tel: 781 740 8778 Fax: 781 740 8779
e-mail: sales@topac.com

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