Information

2638A Hydra Series III specifications
7
General specifications
Mains voltage
100 V Setting: 90 V to 110 V
120 V Setting: 108 V to 132 V
220 V Setting: 198 V to 242 V
240 V Setting: 216 V to 264 V
Line frequency
47 Hz to 440 Hz
Power consumption
36 VA peak (24 W average)
Temperature
Operating: 0 °C to 50 °C
Storage: -20 °C to 70 °C
Warm-up: 1 hour to full accuracy
specifications
Relative humidity
(non-condensing)
Operating: 0 °C to 28 °C <90 %
28 °C to 40 °C <75 %
40 °C to 50 °C <45 %
Storage: -20 °C to 70 °C <95 %
Input protection
Front panel: 300 V CAT II
Input module: 150 V CAT II, 250 V
rms with maximum transient voltage
of 1000 V peak.
Channel capacity
Universal channel:
61 (1 on front panel)
Current channels:
2 per input module (1 on front panel)
Digital I/O: 8 bits
Totalizer: 1
Alarm outputs: 6
Trigger input: 1
Math channels
Number of channels: 20
Operations: Add, subtract, multiply,
divide, average, polynomial, log,
exponent, absolute value, minimum,
maximum, reciprocal, square root
Trigger types: Interval, external
(trigger input), alarm, remote (bus),
manual
LAN: Ethernet 10/100, TCP/IP
USB: (virtual serial port) full speed;
rear port Type B
USB: Front port; Type A
Memory
Scan data RAM: 1 Mb
Data flash memory: 10 Mb
Setup flash memory: 10 Mb
Scan rate
Fast: 46 channels per second max (dc)
Medium: 17 channels per second
Slow: 3 channels per second
Display resolution: 4.5 to 6.5 digits,
depending on function and sample
rate
Digital I/O
Absolute voltage range: -4 V to 30 V
Input minimum logic high: 2.0 V
Input maximum logic low: 0.7 V
Totalizer
Minimum pulse width: 100 μs
Maximum frequency: 10 kHz
Debounce time: 5 ms
Maximum count: 1048575
Hydra™ Series
Input Range Resolution Accuracy
DC volts 100 mV to 300 V 0.1 µV to 1 mV 0.0024 %
DC current 100 µA to 100 mA 0.1 nA to 100 nA 0.015 %
AC volts 100 mV to 300 V 0.1 µV to 1 mV 0.11 %
AC current 100 µA to 100 mA 0.1 nA to 100 nA 0.3 %
Resistance 100 Ω to 100 MΩ 0.1 m Ω to 100 Ω 0.01 %
Frequency 20 Hz to 1 MHz 0.01 Hz to 1 KHz 0.01 %
RTD (pt) -200 °C to 600 °C 0.001 °C 0.016 °C
Thermistor -40 °C to 150 °C 0.001°C 0.007 °C
Thermocouple
type
Range Resolution Accuracy
(External) CJC
Accuracy
(Internal) CJC
K -270 °C to 1372 °C 0.01 °C 0.15 °C 0.50 °C
T -270 °C to 400 °C 0.01 °C 0.11 °C 0.41 °C
R -50 °C to 1768 °C 0.01 °C 0.47°C 0.52 °C
S -50 °C to 1768 °C 0.01 °C 0.54 °C 0.60 °C
J -210 °C to 1200 °C 0.01 °C 0.12 °C 0.53 °C
N -270 °C to 1300 °C 0.01 °C 0.17 °C 0.44 °C
E -270 °C to 1000 °C 0.01 °C 0.09 °C 0.45 °C
B 100 °C to 1820 °C 0.01 °C 0.55 °C 0.55 °C
C 0 °C to 2315 °C 0.01 °C 0.33 °C 0.54 °C
D 0 °C to 2315 °C 0.01 °C 0.32 °C 0.44 °C
G 0 °C to 2315 °C 0.01 °C 0.32 °C 0.33 °C
L -200 °C to 900 °C 0.01 °C 0.12 °C 0.48 °C
M -50 °C to 1410 °C 0.01 °C 0.14 °C 0.41 °C
U -200 °C to 600 °C 0.01 °C 0.11 °C 0.40 °C
W 0 °C to 2315 °C 0.01 °C 0.32 °C 0.33 °C
Trigger
Absolute voltage range: -4 V to 30 V
Minimum logic high: 2.0 V
Maximum logic low: 0.7 V
Minimum pulse width: 100 μs
Maximum latency: 100 ms
Alarm Output
Absolute voltage range: -4 V to 30 V
Output type: Open drain active low
Output logic low: 0 V to 0.7 V
Maximum sink current: 100 mA