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E308 DC & Strain Gauge Amplifier / Panel Meter Unit
E308 Image

The RDP Electronics E308 a.c. powered digital indicator/conditioner unit can be used with the RDP Electronics series of capacitive transducers amongst others.

The E308 panel meter has two modes, voltage mode and millivolt mode.

In voltage mode, the E308 digital display unit provides signal conditioning for a wide range of internally amplified and high output transducers. The signal conditioning unit can provide excitation for many units as well as signal conditioning for the return signals.

In millivolt mode, the E308 Digital Indicator/Conditioner is a strain gauge amplifier. In addition to being a strain gauge amplifier, it also provides precision excitation for the strain gauge transducer. Shunt calibration is available using the front panel shunt calibration switch. This means that suitable transducers having a shunt calibration figure on their calibration certificate may be calibrated with the strain gauge amplifier unit without the need to apply load / pressure etc.

Although it has a digital display the unit actually has analogue electronics which means that it has a very high analogue bandwidth and a high speed limit trip facility. The use of analogue electronics also ensures that the unit can be easily configured using screw driver potentiometers. The E308 can be used in a panel, on a bench or in an optional portable instrument

The E308 indicator/conditioner has two outputs; voltage and 4-20mA. Both voltage and 4-20mA outputs are available in parallel but only one may be calibrated.

Dimensions Bezel size 144mm wide 72mm high Max depth 245mm (incl connectors)
Panel cut out 139mm wide 67mm high
Supply (Via std a.c. lead) 240Vac (120Vac via solder links), +10%,-20% 50/60hHz, 10VA typ.
Display 11mm high brightness 4.5 digit red LED
Display Update 2.5/second
Transducer Excitation 0 to +15V (variable) plus -15V (fixed)
Amplifier output. ±10V @ 5mA max or 4-20mA into 500 Ohms max
Signal input range (for 19999 display) High Gain 5 to 260mV, low gain 1.7V to 90V dc.
Linearity ±0.02% F.S.
Bandwidth Flat to 150Hz, 3Hz with switchable filter.
Noise Output 2mV RTO + 2µV RTI with filter off. (high gain mode). 4mV RTO ( low gain mode).
Input Impedance 2M Ohms
Zero Stability (typical) 0.2µV/°C RTI (high gain) mode). 20µV RTI (low gain mode) a
Gain Stability (typical) ±0.005% F.S./°C (display and analogue output)
Zero Adjustment Range ±10 to ±25% F.S. (Depending on fine gain setting)
Limits Twin limits with front panel annunciators and voltage free relays. 5mS response time.
Temperature range 0°C to +50°C (Working), -40°C to 85°C (storage)
Weight 1300gms
Input and Output connections 7 pin DIN (Input), 9 pin D (outputs)
Environmental Protection IP40

Due to the RDP Electronics policy of on-going development, specifications may change without notice.
Any modification may affect the specification of our equipment.