IC697CMM742-LL使用指導(dǎo),GE通用電氣
可編程增益跳線配置增益放大器可配置為1、10、100、200和500以處理低至±10 mV的信號(hào)電平。表5.4.7-1顯示了哪個(gè)跳線將安裝。該電路板在工廠配置為增益“一”（無跳線）已安裝）。5.5校準(zhǔn)出廠前，VMIVME-3112板已完全校準(zhǔn)并符合第2節(jié)中列出的所有規(guī)范。應(yīng)該然而，需要重新校準(zhǔn)，執(zhí)行第5.5.2節(jié)和5.5.3使用第5.5.1節(jié)中列出的設(shè)備。所有調(diào)整的位置和測(cè)試點(diǎn)如圖5.4-1所示。出廠時(shí)，所有校準(zhǔn)調(diào)整均密封防止意外移動(dòng)。密封件很容易被打破以進(jìn)行重新校準(zhǔn)，然而所有調(diào)整均應(yīng)使用合適的密封件重新密封完成重新校準(zhǔn)后的化合物。
IC697CMM742-LL使用指導(dǎo)所需設(shè)備
a、 數(shù)字電壓表（DVM）?！?.0000 VDC和±10.000 VDC范圍；5.或更多數(shù)字；讀數(shù)電壓測(cè)量值的±0.005%精確10米? 最小輸入阻抗。b、 模擬電壓源?！?0.000 VDC范圍；分辨率0.0005
VDC；精度，預(yù)期值的±0.005%；0.10? 最大限度輸出阻抗。c、 底盤。VMEbus背板或等效物，J1和J2連接器，VMEbus主控制器，+5±0.1 VDC，電源。一個(gè)插槽分配用于測(cè)試VMIVME-3112板。d、 延長板。VMEbus擴(kuò)展板。e、 測(cè)試電纜。測(cè)試上述設(shè)備的電纜。5.5.2模擬輸入校準(zhǔn)程序校準(zhǔn)包括將轉(zhuǎn)換器的最大負(fù)輸出調(diào)整為其理想值（偏移調(diào)整），然后將最大正輸出調(diào)整為其理想值值（增益調(diào)整）。在更換時(shí)必須執(zhí)行校準(zhǔn)A/D的輸入滿標(biāo)度范圍從一個(gè)值到另一個(gè)值（例如，從±10 V到±5 V）。程序如下：a、 將VMIVME-3112板安裝在VMEbus的擴(kuò)展板上背板。b、 將模擬輸入配置為所需的電壓范圍（即±10 V，±5 V，0至+10 V）。c、 給背板通電。允許最小預(yù)熱間隔為通電后10分鐘后繼續(xù)。d、 將模擬電壓源連接在連接器引腳之間的CH0處P3-A1（+）和P3-C1（-）。e、 調(diào)整模擬電壓源以進(jìn)行最負(fù)校準(zhǔn)所選滿標(biāo)度范圍的值。見表5.5.2-1。f、 讀取CH0時(shí)，調(diào)整R4的單極范圍或R8的雙極范圍角。CH0地址為XXXX0080。繼續(xù)調(diào)整電位計(jì)，直到讀取的值在000 HEX和001之間閃爍十六進(jìn)制。
g、 調(diào)整模擬電壓源以進(jìn)行最正向校準(zhǔn)所選滿標(biāo)度范圍的值。見表5.5.2-1。h、 讀取CH0時(shí)，調(diào)整R9，直到讀取的值在FFE和FFF六角。i、 校準(zhǔn)現(xiàn)已完成。拆除所有測(cè)試連接，以及將電路板恢復(fù)到其原始配置。
Programmable Gain Jumper Configuration
The Gain Amplifier may be configured for gains of 1, 10, 100, 200, and
500 to handle signal levels as low as ±10 mV. Table 5.4.7-1 shows which jumper
is to be installed. The board is factory configured for a gain of "one" (no jumper
installed).
5.5 CALIBRATION
Before delivery from the factory, the VMIVME-3112 Board is fully
calibrated and conforms to all specifications listed in Section 2. Should
recalibration be required, however, perform the procedures in Sections 5.5.2 and
5.5.3 with the equipment listed in Section 5.5.1. The locations of all adjustments and
test points are shown in Figure 5.4-1.
As delivered from the factory, all calibration adjustments are sealed
against accidental movement. The seals are easily broken for recalibration,
however. All adjustments should be resealed with a suitable fact curing sealing
compound after recalibration has been completed. Equipment Required
a. Digital Voltmeter (DVM). ±1.0000 VDC and ±10.000 VDC ranges; 5
or more digits; ±0.005 percent of reading voltage measurement
accuracy; 10 M? minimum input impedance.
b. Analog Voltage Source. ±10.000 VDC Range; resolution 0.0005
VDC; Accuracy, ±0.005 percent of expected value; 0.10 ? maximum
output impedance.
c. Chassis. VMEbus backplane or equivalent, J1 and J2 connectors,
VMEbus master controller, +5 ±0.1 VDC, power supply. One slot
allocated for testing the VMIVME-3112 Board.
d. Extender Board. VMEbus extender board.
e. Test Cables. Test cables for the equipment listed above.
5.5.2 Analog Inputs Calibration Procedure
Calibration consists of adjusting the converter's most negative output to
its ideal value (offset adjustment), next adjusting the most positive output to its ideal
value (Gain Adjustment). The calibration must be performed when changing the
A/D's input full scale range from one value to another (for example, from ±10 V to
±5 V). The procedure is as follows:
a. Install the VMIVME-3112 Board on an extender board in a VMEbus
backplane.
b. Configure the analog inputs to the desired voltage range (i.e. ±10 V,
±5 V, 0 to +10 V). c. Apply power to the backplane. Allow a minimum warm up interval of
ten minutes after power has been applied before proceeding.
d. Connect the analog voltage source at CH0, between connector pins
P3-A1 (+) and P3-C1 (-).
e. Adjust the analog voltage source for the most negative calibration
value of the full scale range selected. Refer to Table 5.5.2-1.
f. While reading CH0 adjust R4 for unipolar ranges or R8 for bipolar
angles. CH0 address is XXXX0080. Continue adjusting the
potentiometer until the value read flickers between 000 HEX and 001
HEX.
g. Adjust the analog voltage source for the most positive calibration
value of the full scale range selected. Refer to Table 5.5.2-1.
h. While reading CH0 adjust R9 until the value read flickers between
FFE and FFF HEX.
i. Calibration is now complete. Remove all test connections, and
restore the board to its original configuration.
