Table of Contents
Advertisement
_________________________________________________________________________________________________________________
(17) Mains connector
Plug socket for the mains power-plug.
Important: Check line voltage before connecting the ELC amplifier to power. Always use a
three-wire line cord and a mains power-plug with a protection contact connected to ground.
Disconnect mains power-plug when replacing the fuse or changing line voltage. Replace fuse
only by appropriate specified type (one spare fuse is supplied). Before opening the cabinet
unplug the instrument.
SEAL TEST SIGNALS connectors (optional)
The SEAL resistance is determined similar to the R
±10 mV square pulses with 15 Hz are applied to the pipette and the resulting current is
measured. The resistance is calculated according to Ohm's law and is indicated on the
CURRENT DISPLAY. The maximum SEAL resistance that can be displayed is 19.99 G.
The value of the SEAL resistance is also monitored at 20 (see below).
(18) COMMAND MONITOR (TTL) connector
BNC connector providing a TTL (+5V) signal synchronous to the ±10 mV test pulses.
(19) SEAL TEST INPUT (TTL) connector
Starts seal test remotely (see also 36, Figure 1).
(20) OUTPUT SEAL 0.1V / G connector
BNC connector monitoring the value of the SEAL resistance; scaling 100 mV / G.
Grounding
ELC instruments have two ground systems:
1. the internal ground (called internal GROUND) represents the zero level for the
recording electronics and is connected to the recording chamber and the BNC
input/output sockets
2. mains ground (CHASSIS) is connected to the 19" cabinet and through the power cable
to the protection contact of the power outlet.
Both grounds are provided at the rear panel:
GROUND (black socket):
CHASSIS (green/yellow socket): mains ground, 19" cabinet
All ELC systems have a high quality toroid transformer in order to minimize stray fields. In
spite of this, noise problems could occur if other mains-operated instruments are used in the
same setup. The internal system ground (GROUND sockets) should be connected to only one
point on the measuring ground. Multiple grounding should be avoided, i.e. all ground points
should originate from a central point to avoid ground loops.
___________________________________________________________________________
version 2.2
ELC-03XS User Manual
test.
EL
internal system ground
page 21
Advertisement
Table of Contents
