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Digital Panel Meter
High Speed Set Point Comparator
Asahi Digital panel meters from Asahi Keiki
offer impressive specifications, reliability
 and low cost for a variety of applications
 
AMH-752      Features
  • High conversion rate 1000 - 4000/sec
  • 2 input computation
  • Peak, Valley, Peak-Valley Hold, Digital zero.
  • 4 sets/ pattern setting (EEPROGRAM back up)
  • Power supply AC 90 - 264 Volts
  • Digital Zero (option)
  • Data output BCD, RS232, or analog
  • Relay or photo-coupler comparator output
Comparator AMH-752 high conversion rate
 
DC Voltage Measurement
Accuracy ± 0.1% of reading ± 2 digit (a</=1)(23° C ±5°C) normal speed mode
± 0.1% of reading ± 4 digit (23° C ±5° C)(a</=1) High speed mode
1-5V
± 0.1% of reading ± 3 digit (23°C ±5°C)(a</=1)normal speed
± 0.1% of reading ± 5 digit (23° C ±5°C)(a</=1) High speed mode
Model Range Display
adjustable		 Input 
Impedance		 Max Allowable
input voltage		 view shopping cart
AMH 752-11 ±199.9 mV offset
± 1999
Full scale
 ± 1999
 100 MOhm ± 250 V  
AMH 752-12 ±1.999 V 100 MOhm ± 250 V
AMH 752-13 ±19.99 V 10 MOhm ± 250 V
AMH 752-14 ±199.9 V 10 MOhm ± 500 V
AMH 752-1V 1 - 5 Volts 1 MOhm ± 250 V
 
DC Current Measurement
Accuracy ± 0.2% of reading ± 2 digit (23°C ±5°C)(a</=1)normal speed
± 0.3% of reading ± 2 digit only for -25 range ~ normal speed
± 0.2% of reading ± 4 digit (23° C ±5°C)(a</=1) High speed mode
± 0.3% of reading ± 4 digit only for - 25 range ~ High speed mode
4-20mA
± 0.1% of reading ± 3 digit (23°C ±5°C)(a</=1)normal speed
± 0.1% of reading ± 5 digit (23° C ±5°C)(a</=1) High speed mode
Model Range Display
adjustable		 Input
Impedance		 Max allowable
input current		 view shopping cart
AMH 752-21 ±199.9 uA offset
± 1999
Full scale
 ± 1999		 1 kOhm ± 10mA  
AMH 752-22 ±1.999 mA 100 Ohm ± 50mA  
AMH 752-23 ±19.99 mA 10 Ohm ± 150 mA  
AMH 752-24 ±199.9 mA 1 Ohm ± 500 mA
AMH 752-25 ±1.999 A 0.1 Ohm ± 3 A
AMH 752-2A 4 - 20 mA  10 Ohm ± 150 mA
 
General Specifications
Click For Diagrams
Measurement Block AMH-752
Measurement function Specify one measuring range from DC voltage, current ranges below.
Input circuit single ended
Number of inputs 2 channels A & B
Operation method Successive approximation
Input Bias Current 1nA
Conversion Rate 1.25 /sec to 4000 /sec for channel 1
0.652 /sec to 2000 /sec for channel 2 
Mode High Speed Mode
No 1 2 3 4
Rate 
1ch/sec		 4000
(1)		 2000
(2)		 1333.3
(3)		 1000
(4)
2 ch/sec 2000 1000 666.7 500
Mode Normal Speed Mode
No 5 6 7 8 9 10
Rate 
1ch/sec		 1000
(5)		 500
(10)		 250
(20)		 125
(40)		 100
(50)		 50
(100)
2 ch/sec 500 250 125 62.5 50 25
Mode Normal Speed Mode
No 11 12 13 14 15 16
Rate 
1ch/sec		 25
(200)		 12.5
(400)		 10
(500)		 5
(1000)		 2.5
(2000)		 1.5
(4000)
2 ch/sec 12.5 6.25 5 2.5 1.25 0.625
Normal mode rejection > 50dB (50/60Hz)
Display 7 segment LED, 10 mm red
monitor sub display LED 8mm green
Display speed 12.5/sec normal speed mode only.
Polarity "-" automatic when result is negative
Decimal point Set to any position
Over-range indication LED flashes value just before overload
Maximum Display  ± 1999 ( 5 digits )
Decimal point set to any position
Zero Display leading "zero" suppression
 
External Control AMH-752
Start/Hold Start hold type A
Start - start terminal open (or 5V)
Hold - shorting between digital common and hold terminal or 0V
Sample Hold type B
Only one measurement is performed from the rise of +ve or -ve pulse of more than 500 uS and the result is output
Digital zero (DZ)
(settable on front panel)		 Digital COM and DZ terminals are shorted, or input is set to "0",  displayed as "zero" and that value is stored. A and B channels can be zeroed independently.
Peak Hold (PH) Respective function is activated when COM and PH terminals are shorted or input level is set to "0" Only effects the display.
Valley Hold
Peak Valley Hold
 
Comparison Block AMH-752
Control Method Computation by microcomputer
Measuring range
comparison		 high/Low limit setting including polarity, -1999 to + 1999
Setting condition By sampling period
No setting condition for set value
Comparison Condition (display)  
High/High limit set-value < measured value HH
High/High limit set-value > measured value>high limit set value HI
High limit set value >/= measured value>/= Low limit set value GO
low limit set value < measured value>/= Low/Low limit set value LO
Low/Low limit set value > measured value (LO)LL
Comparison relay output  HH, HI, GO, LO and LL
 relay output cycle ~ 12 .5 mS
at 1ch input Conversion rate:
When speed is lower than 80/sec, output of each sampling.
When the speed is faster than 80/sec outputs the results at ~12.5 mS intervals
Comparison Relay
contact capacity		 250 Volts AC 0.1A resistive load
120 Volts AC 0.5A resistive load
28 Volts DC 1 A resistive load
Photo-coupler output sink current 20 mA max )less than 30 V.
NPN open collector.
Photo-coupler output cycle ~ 250 us at the sampling speed of 4000/sec for 1 ch input
for others depends on sampling speed.
Hysteresis Settable from 1 to 999 digits for each comparison set value
External Control Comparison operation is suspended when COM and  Reset terminals are shorted or input level is set to "0"
"0" level less than 1.5 V
"1" level 3 to 30 V - input current < - 5mA
  
Common Specifications AMH-752
Memory Backup Set data stored for 10 years by EEPROM
Temperature and humidity 0 - 50°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 158 DIN
Weight Approx 600 g
Dielectric Strength 500 V DC between input/earth and case
500 V DC between input terminal/common, digital common, relay output transistors..
1500 VAC between power supply terminal/common, digital common, relay common, transistor output.
Insulation Resistance DC 500V 100 MOhm at above terminals
Sensor Power Supply 10 V +/- 10%, 80 mA
  
Optional Outputs AMH-752
BCD output (isolated from input (LO))
BCD Output Tristate parallel BCD output, Fan out 2
Polarity signal at minus value - "1"
OVER signal At overflow - "1"
Printing Command Signal at end of A/D conversion, plus pulse in ~ 500us width
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
 
Analog Output (isolated from input (LO))
Any display range to output analog signal can be set
output voltage  ± 0-2.5 V
Resolution 0.25 mV/digit
Accuracy 0.5%FS (23° C ±5°C)
Over-voltage   ± 3.5 V, less than 5 V
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.
 
Ordering Information
AMH-752-xx-w-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,  1V
Current 21, 22, 23, 24, 25 2A		    
Affix w Power supply voltage
1= 90 - 132 VAC, 2= 180-264VAC		    
Affix y With Data Output
1 = None
2 = BCD
3 = Analog
4 = BCD, Analog
R = RS232C		 $875.00
$899.00
$1070.00
$1100.00
$950.00		  
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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