Input Channel
Nrog rau lub suab nrov qis analog ua ntej amplifier, lub teeb liab tawm tswv yim ntawm DXA-004 tuaj yeem hloov mus ua haujlwm nyob rau hauv ib qho kawg lossis qhov sib txawv voltage hom, thiab lub suab nrov yog 6 nV / √Hz @ 100 kHz. Lub input impedance yog 50 Ω los yog 10 MΩ thiab tag nrho-scale input voltage rhiab heev ntawm 1 nV mus rau 1V. Ob kab lim (50/60 Hz thiab 100/120 Hz) yog tsim los tshem tawm cov kab cuam tshuam. Lub programmable nce amplifier yog muab los kho qhov dynamic cia ntawm lub kaw lus raws li qhov loj ntawm lub teeb liab tawm tswv yim, kom DXA{15}} muaj qhov tshwj xeeb loj dynamic cia txog 120dB. Tus nqi piv txwv ntawm 250MSPS yog txiav txim los ntawm qhov tseeb 14-ntsis A/D converter thiab ib lub lim dej tshwj xeeb yog tsim los kom tsis txhob muaj aliasing.
Reference Channel
Txhawm rau muab cov teeb liab siv rau DXA{{0}}, ib qho kev siv sab nraud siv sine yoj lossis square nthwv dej, lossis nws tus kheej siv cov ntaub ntawv sib txuas sab hauv. Thaum lub ntsuas ntsuas tau teeb tsa rau hom siv sab hauv, qhov ntsuas qhov ntsuas sab hauv stabilized oscillator thiab cov digital synthesized algorithm yog siv los tsim cov khoom siv sinewave uas ua rau cov teeb liab tawm tswv yim, tsis muaj qhov siv suab nrov thaum xaiv hom siv sab hauv. Ua kom zoo dua ntawm cov thev naus laus zis hloov pauv cov txheej txheem, cov theem teeb tsa siv tau tuaj yeem hloov kho nrog 0.001 degree daws teeb meem. Hom kev siv sab hauv tuaj yeem ua haujlwm ntawm qhov zaus ntawm 1 mHz txog 60 MHz. Tsis tas li ntawd, cov ntaub ntawv siv sab nraud kuj tseem siv tau rau DXA-004, suav nrog cov teeb liab sinewave thiab TTL logic siv teeb liab. Qhov nce thiab trailing ntug ntawm cov teeb liab siv sab nraud yog siv los ua kom tawm hauv Phase Locking Loop (PLL). Raws li qhov zaus ntawm cov teeb liab siv, kev kuaj pom kev sib haum xeeb tuaj yeem ua tau los ntawm DXA-004. Qhov siab tshaj plaws ntawm qhov ntsuas kev sib haum xeeb yog 32767 lub sijhawm ntawm qhov yooj yim zaus, thiab nws tseem tsawg dua qhov ua haujlwm siab tshaj plaws 60 MHz.
Digital Demodulator thiab tso zis lim
The key component of the DXA-004 is the digital demodulator. Compared to traditional analog lock-in amplifiers, the DXA-004's internal digital demodulator effectively rejects the measurement errors caused by DC drift and offset. In addition, by optimizing the multiplication of the internal coherent signal of the digital demodulator, the calculation error is minimized so that the instrument can accurately detect the input weak signal. Time constants of the output low-pass filter from 30 ns to 4.4 ks can be selected with a choice of 6,12, 18, 24, 30, 36, 42 and 48 dB/oct roll off. This low-pass digital filter is implemented using a high performance digital filter with a sample rate of 250 MHz. The digital demodulation and the low-pass filter used in DXA-004 guarantee a high dynamic reserve (>120dB), thiab yog theem (tsis muaj theem yuam kev<1 deg). Moreover, when the frequency of the input signal is lower than 200 Hz, A synchronous filter can be used to eliminate the harmonic influence of the reference signal, ensuring that DXA-004 can detect a low frequency signal quickly and effectively.
Zaub
DXA-004 muaj 5.6-inch 640 x 480 xim TFT-LCD. Cov txiaj ntsig kev ntsuas ntawm DXA-004, xws li X, Y, R, thiab θ, tau pom nyob rau hauv daim ntawv tus lej thiab daim duab kos rau ntawm daim duab. Hauv XY daim ntawv qhia, DXA-004 qhia txog qhov sib txawv ntawm kev ntsuas cov txiaj ntsig dhau sijhawm, thiab tshuaj xyuas tus nqi los ntawm kev siv tus cursor pob qhov rooj.
Chaw taws teeb ua haujlwm
Cov neeg siv tuaj yeem siv lub PC los tswj DXA-004 los ntawm kev sib txuas lus sib txuas, suav nrog kev teeb tsa qhov ntsuas thiab nyeem cov ntaub ntawv ntsuas. DXA-004 yog nruab nrog ib qhov kev pab cuam LabVIEW pub dawb, uas ua rau nws yooj yim rau siv hauv kev sim kev tshawb fawb nyuaj.
Teeb liab Channel
| Voltage input hom | Ib leeg-kawg los yog Differential |
| Full-scale Sensitivity | 1 nV to 1 V in a 1-2-5 sequence |
| Impedance | |
| Qhov hluav taws xob | 50 Ω // 5pF lossis 10 MΩ // 5pF, AC lossis DC txuas |
| C.M.R.R | >70 dB rau 100 Hz |
| >50 dB rau 100 kHz | |
| Dynamic reserve | >120 dB |
| Tau qhov tseeb | 0.5% typ(<1MHz), 3% max |
| Lub suab nrov | |
| 14 nV / √Hz ntawm 997 Hz | |
| 6nV / √Hz ntawm 99.99 kHz | |
| Kab lim | 50/60 Hz thiab 100/120 Hz |
| Hauv av | BNC ntaub thaiv npog tuaj yeem ua rau hauv av lossis ntab ntawm 10 kΩ rau hauv av |
Reference Channel
| Tswv yim | |
| Ntau zaus | 1 MHz txog 60 MHz |
| Kev siv tswv yim | TTL sau Sine |
| Input impedance | 1 MΩ |
| Square siv theem | VIH>3 V, VIV<0.5V |
| Sine reference signal | >1 Hz |
| >400m wb | |
| Theem | |
| Kev daws teeb meem | 0.001 degree |
| Kev ua yuam kev tsis raug | <1° |
| kwv tij theem yuam kev | <1 mdeg |
| Phase suab nrov | |
| Internal ref. Synthesized,<0.0001 deg at1 kHz | |
| Sab nraud ref. 0.001 deg ntawm 1 kHz (100 ms lub sij hawm tas li, 12 dB/oct) | |
| Drift | |
| <0.01 deg/℃ below 100 kHz | |
| <0.1 deg/℃ above 100 kHz | |
| Harmonic nrhiav tau | 2F, 3F, …nF txog 60 MHz (n<32,767) |
| Lub sijhawm tau txais | |
| Internal Ref. Kev yuav khoom sai sai | |
| Sab nraud Ref. (2 cycles + 5 ms) lossis 40 ms, qhov twg loj dua | |
| Demodulator | |
| Kev ruaj ntseg | |
| Digital outputs | tsis muaj xoom drift ntawm tag nrho cov teeb |
| Zaub | tsis muaj xoom drift ntawm tag nrho cov teeb |
| Analog tso zis | <5 ppm/℃ for all dynamic reserve settings |
| Harmonic tsis kam | -90 dB |
| Lub sij hawm tsis tu ncua | 30 ns rau 4.4 ks (6,12,18,24,30,36,42,48 dB/oct yob tawm) |
| Synchronous lim | Muaj nyob hauv qab 200 Hz (18,24,30,36,42,48 dB / oct yob tawm) |
Internal Oscillator
| Ntau zaus | Ntau zaus 1 mHz txog 60 MHz |
| Qhov tseeb | 2 ppm + 10 µHz |
| Kev daws teeb meem | 1 mhz |
| Distortion | -80 dBc (f<10 kHz),-60 dBc (f>1 MHz) |
| Amplitude | 1 uVrms rau 1 Vrms (Resolution: 1 uVrms) |
| Qhov tseeb | 0.50% |
| Kev ruaj ntseg | 50 ppm / degree |
| Sine Outputs | |
| Sine teeb liab, tso zis impedance 50 Ω | |
| TTL tawm | 5V TTL / CMOS theem, tso zis impedance 50Ω |
Zaub
| Screen | 5.6 nti, 640 × 480 TFT |
| Screen hom ntawv | Ib leeg lossis dual zaub |
| Qhia kom muaj nuj nqis | Txhua cov zaub qhia ib kab, |
| Cov kab tuaj yeem txhais tau tias yog X, Y, R, θ | |
| Zaub hom | Daim ntawv naj npawb, bar graph |
AUX Inputs thiab Outputs
| AUX Inputs | |
| Muaj nuj nqi | 4 Channel Inputs |
| Amplitude | ± 10 V, 1 mV daws teeb meem piv |
| Impedance | 1 MΩ |
| AUX/CH Outputs | |
| Muaj nuj nqi | 4 Channel tso zis |
| Amplitude | ± 10 V, 0.1 mV daws teeb meem piv |
| Tsav tam sim no | 30mA max |
Interfaces
USB2.0 , RS-232(DB-9) thiab 1000Mbps Enthernet
General
| Lub zog xav tau | |
| Qhov hluav taws xob | 220 ~ 240V AC |
| 100 ~ 120 VAC (yeem) | |
| Ntau zaus | 50/60 Hz |
| Hwj chim | 60 W |
| Kev tsis lees txais cov khoom siv hluav taws xob | 70dB@1MHz |
| Qhov hnyav | 12 KG |
| Qhov ntev | |
| Dav | 448mm ib |
| Qhov tob | 5 13mm |
| Qhov siab | |
| Nrog ko taw | 14 8mm |
Xa, shipping thiab pab
Peb muab ntau yam kev xaiv shipping, suav nrog hiav txwv, huab cua, thiab kev xa khoom xa tuaj, kom tau raws li kev xav tau ntawm peb cov neeg siv khoom. Peb lub hom phiaj yog los muab cov kev daws teeb meem zoo thiab pheej yig shipping uas ua tau raws li lawv cov kev xav tau tshwj xeeb. Nrog rau peb cov kev pabcuam shipping ntau yam, peb muab qhov tseem ceeb rau kev xa cov kev pabcuam zoo rau cov neeg siv khoom. Peb pab neeg mob siab rau ua kom koj paub thiab muab kev pab thoob plaws hauv txoj kev xa khoom.
FAQ
1. Dab tsi yog qhov ntsuas phoo hauv amplifier?
Teb: Lub xauv-hauv amplifier yog ib qho khoom siv hluav taws xob uas siv los ntsuas thiab nthuav dav cov khoom siv zaus hauv lub teeb liab. Los ntawm theem-xauv nrog cov teeb liab tawm tswv yim, nws tuaj yeem raug tshem tawm cov cim tsis muaj zog faus rau hauv lub suab nrov tom qab. Lock-in amplifiers feem ntau yog siv rau hauv kev sim kev tshawb fawb thiab kev ntsuas meej hauv cov teb xws li optics, electronics, thiab magnetism.
2. Lub tshuab hluav taws xob kaw lus ua haujlwm li cas?
Teb: Lub hauv paus ntsiab lus ntawm lub xauv-hauv amplifier yog rau theem-synchronously xauv lub teeb liab los ntsuas nrog lub teeb liab siv, thiab tom qab lim, amplification, thiab lwm yam, nws tso tawm lub teeb liab uas ob qho tib si amplitude thiab theem cov ntaub ntawv tau ntsuas. . Txoj kev no muaj txiaj ntsig zoo tshem tawm cov cim tsis muaj zog, ua rau lub suab nrov tom qab, thiab txhim kho kev ntsuas qhov ntsuas thiab qhov tseeb.
3. Dab tsi yog thaj chaw thov ntawm lub tshuab hluav taws xob kaw?
Teb: Xauv-hauv amplifiers tau siv dav hauv kev tshawb fawb tshawb fawb, kev tsim khoom lag luam, thiab kev ntsuas ntsuas qhov tseeb. Hauv kev sim kho qhov muag, xauv-hauv amplifiers yog siv los ntsuas qhov cuam tshuam ntawm qhov muag, qhov muag pom kev tawg, thiab lwm yam tshwm sim; nyob rau hauv cov khoom siv hluav taws xob, lawv tau siv los txheeb xyuas cov cim tsis muaj zog thiab cov suab nrov cuam tshuam; nyob rau hauv biomedical teb, lawv yog siv los tswj thiab saib xyuas cov cuab yeej kho mob, thiab lwm yam. Feem ntau, kaw-hauv amplifiers ua lub luag haujlwm tseem ceeb hauv kev txhim kho lub teeb liab ntsuas qhov tseeb thiab kev tawm suab nrov.