GDP-32
II
INSTRUCTION MANUAL
October 2002 Section 12, Page 30
12.16 EQUAL-INTERVAL MODE, TEM
General
A version of the TEM program that runs on the Zonge GDP-32
II
receiver permits TEM transients
to be uniformly sampled and stored as time series to the hard disk. The window parameter may
be toggled between ZONGE STANDARD, SHALLOW and EQUAL INTERVAL acquisition
modes. The ZONGE STANDARD TEM data acquisition modes are described in the TEM
sections of this manual. When the TEM program is operating in the EQUAL INTERVAL mode,
it writes the program name TEME to each of the data blocks stored to the data cache.
The program stores the first 31 samples of the transient time series to the data cache using a
format identical to that of the TEM program. However, the entire transient waveform that
usually contains many more samples is written to a disk file whose name is BLKnnnn.TEM
where nnnn is a 4-digit integer corresponding the GDP32
II
block number of the data
measurement. The transient data files are written in binary for efficient storage and data transfer.
But they are easily transformed into ASCII text format using one of DOS executable utilities
furnished when a receiver is purchased with this version of the TEM program.
The TEM Equal Interval program can handle a maximum of 65536 bytes of data. Since each
sample point takes 4 bytes, the maximum number of sample points that can be acquired is 16384.
Divide this number by the number of channels to determine the number of samples per channel
that can be acquired.
Operating Instructions
With a few minor differences as explained below, the TEME program operates the same as the
TEM program.
MENU 1:
Select the EQUAL INTERVAL option by moving the cursor to the WINDOWS field and toggling
between EQUAL INTERVAL, SHALLOW, and ZONGE STANDARD options. The remaining
parameters are the same as in the standard TEM program.
MENU 4:
In MENU 4 (the last menu before data are acquired) there are three selectable parameter fields:
Width: This field selects the sample interval. The minimum sample interval is governed
by the frequency selected in the Frequency parameter field of this menu (see page TEM-16
of the GDP-32
II
manual). Sample intervals ranging from 30.4 µs to 1.946 ms are selectable.
At frequencies below 4 Hz, the minimum sample interval changes on binary increments from
60.8 µs up to 1.946 ms.
Start: This field specifies the delay time in sample intervals from the logic time of
current turn-off to the first sample of the transient. No corrections for transmitter delay filter
delays antenna delays, or current turnoff times are applied. Delays of up to a quarter of a
period are permitted (i.e., Start <
T/(4∆t)).
Count: This field specifies the number of samples to be acquired. Note there will be a
maximum number of samples that can be acquired that is equivalent to a time period of T/4
(i.e. Count <T/(4∆t)).
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