43-TV-25-30 Iss.6 GLO Aug 07 UK 21
Analogue Output Card
Not available on the eZtrend QXe recorder.
The Analogue Output card connections are made via 1 x 12-way screw terminal plug that
fits into a PCB header on the rear of the unit.
The Analogue Output card position for the Minitrend QX
is shown in Figure 2.3 on
page 14, and Figure 2.4 on page 15 for the Multitrend SX.
CAUTION
CONTROL UNIT DAMAGE
Do not apply a hazardous live voltage between + and - pins within a channel (e.g. 60V
maximum on voltage ranges, 5V maximum on millivolts ranges).
The * pin should be connected only as part of ohms or R/T measurements. Ohms and
R/T measurements share a common connection (* pin) with all channels in the same
bank (the inputs are divided into two banks: inputs 1 to 3 are one bank, and inputs 4 to
6, if fitted, are another bank). To avoid damage, ensure that a channel selected as ohms
or R/T remains floating, i.e. the sensor is not connected to any external voltage.
Alternatively, if an ohms or R/T sensor must be biased to an external voltage, ensure
that the other two channels within the same input bank are floating or are biased to the
same voltage (i.e. - inputs of all three channels connected to the same voltage).
Failure to comply with these instructions may result in product damage
WARNING
HAZARDOUS VOLTAGES
Insulation from channel to channel: Normally a channel can be safely connected to a
hazardous voltage up to 300V AC common mode* with respect to earth. However,
where a channel is connected to a safety low voltage circuit, an immediately adjacent
channel must be adequately insulated from hazardous voltages between 150V AC and
300V AC max. This insulation should comprise of at least 1.5mm air gap, or a barrier
rated greater than 1400V AC. This is to ensure that protection of the safety low voltage
circuit is fully maintained.
*Common Mode voltage is a voltage applied between the whole channel and earth, not
between pins on a channel. 300V AC is permitted at Measurement Category CAT ll
(Overvoltage Category ll)
Failure to comply with these instructions could result in death or serious injury.
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