Specifications, Crystal measurement, Data acquisition analog card (optional) – INFICON RQCM - Quartz Crystal Microbalance Research System User Manual
Page 17: Analog inputs, Specifications -3, Crystal measurement -3, Data acquisition analog card (optional) -3, Analog inputs -3
RQCM – RESEARCH QUARTZ CRYSTAL MICROBALANCE
GENERAL DESCRIPTION 1-3
1.2 SPECIFICATIONS
1.2.1 CRYSTAL
MEASUREMENT
Crystal measurement channels:
One standard, three maximum.
Frequency range:
3.8 to 6.06 MHz, or 5.1 to 10 MHz
Frequency resolution:
0.03 Hz @ 6.0MHz
Mass resolution:
<0.4 ng/cm
2
(0.014 Å Aluminum)
Capacitance compensation range:
40 to 200 pfd
Achievable capacitance cancellation:
±
0.3 pfd
Crystal resistance range:
5 Ω to 5.0 KΩ
Phase angle accuracy:
±
2 degrees
Phase angle stability:
±
0.5 degrees
Frequency error vs. phase error and crystal Q:
Q= 100,000 0.087 ppm per degree
Q=10,000 0.87 ppm per degree
Q=1,000 8.7 ppm per degree
Measurement update rate:
From 0.5 to 20 updates/sec
Operating temperature range:
0 to 50°C
Operating temperature range for stated stability: 20 ± 10°C
Controls: Reset
Switch
Capacitance Adjustment Trimmer,
Course and Fine
Indicators:
Green “Lock” LED
Red “Unlock” LED
Yellow “Sweep Rate” LED
Crystal Drive Voltage, open circuit:
125 mV RMS
Crystal Drive Source Impedance:
20 Ω ± 1%
Crystal Power:
200 microwatt, maximum
Crystal Face Isolation:
Transformer, ± 200 VDC maximum
1.2.2
DATA ACQUISITION ANALOG CARD (OPTIONAL)
Except where noted. All specifications @ 25 C. All specifications are within 90 days of
calibration.
1.2.2.1 Analog
Inputs
Number of channels:
5
Resolution:
Selectable range:
0-5V,
0-10V, ± 5V, ± 10V
Zero offset:
±
2mV
Gain accuracy:
±
0.01% (± 0.02% for ±5V & ±10V)
Gain non-linearity:
< 2 LSB
Single ended input impedance:
1 MΩ
Differential input impedance:
2 MΩ
Input protection:
±
200V
Common mode range:
±
200V
Common mode rejection:
70 dB up to 200 Hz