Zonge GDP-32 - Equal-Interval Mode, Nanotem

GDP-32
II
INSTRUCTION MANUAL
October 2002 Section 19, Page 20
19.10 EQUAL-INTERVAL MODE, NANOTEM
General
A version of the NanoTEM program that runs on the Zonge GDP-32
II
receiver permits
NanoTEM 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 NanoTEM data acquisition modes are
described in the NanoTEM sections of this manual. When the NanoTEM program is operating
in the EQUAL INTERVAL mode, it writes EQUAL in the window parameter field in 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 NanoTEM program. However, the entire transient waveform that
usually contains many more samples is written to a disk file whose name is BLKnnnn.NTE
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 NanoTEM program.
The NanoTEM 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 EQUAL INTERVAL NanoTEM program
operates the same as the NanoTEM 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 NanoTEM program.
MENU 4:
In MENU 4 (the last menu before data are acquired) there are three parameter fields:
Width: This field is set to a sample interval of 1.2 µs.
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 1 through 99 are
permitted.
Count: This field specifies the number of samples to be acquired. The maximum number
of samples is 4096.